Executive verdict
The Dutch Hunger Winter was a famine in the occupied western Netherlands during the final winter of the Second World War. Its centre was the urban population of North Holland, South Holland and Utrecht, rather than the whole country equally. NIOD identifies these provinces as especially hard hit and documents journeys towards agricultural areas for food 1.
The familiar death toll of about 20,000 should be treated as an approximation. NIOD reports competing historical estimates, including more than 22,000 direct and indirect deaths, and stresses that a precise total cannot be established 2.
The famine also became a major research setting. Preserved maternity records allowed investigators to compare adults exposed before birth with people born outside the famine period 3. Molecular research subsequently found persistent differences in DNA methylation, a chemical marking of DNA, among people exposed around conception 4.
Our verdict is that the strongest account connects political coercion, the breakdown of food distribution and unequal access to help. The medical research adds evidence that prenatal conditions can matter decades later. It does not turn every later illness into a famine effect, or establish an unbroken biological inheritance of trauma. Read the occupation, the famine and liberation together, while keeping the historical death estimates and the different scientific studies distinct.
Was the Netherlands occupied in the Second World War?
Yes. Germany invaded the Netherlands on 10 May 1940, bombed Rotterdam on 14 May, and obtained the formal military capitulation on 15 May 5. Military defeat brought occupation and the destruction of democratic government, rather than a voluntary Dutch alliance with Germany.
The Dutch parliament's history records that the government left for London in May 1940. The lower house stopped meeting and did not reconvene until September 1945. From 1941, the occupation authorities banned political parties other than the pro-German National Socialist Movement, the NSB 6.
That distinction answers the search question about which side the Netherlands was on. The government continued abroad while German authorities ruled the occupied territory. The existence of Dutch collaborators does not make the occupied state a German ally [6].
Persecution belongs at the centre of this history
The Holocaust cannot be reduced to background for the famine. The Anne Frank House estimates that approximately 104,000 of the roughly 140,000 Jews in the Netherlands did not survive German persecution, about 74%. It explains that the frequently used figure of 102,000 victims has a narrower scope than the broader estimate, which includes deaths within the Netherlands and other persecution deaths 7.
The Netherlands had a German civil occupation regime headed by Arthur Seyss-Inquart, whereas Belgium had a German military administration. The Anne Frank House identifies differences in occupation structures and persecution practices as important to the contrasting experiences of these neighbouring countries [7].
Persecution escalated through exclusion, dispossession and deportation. Arrests of Jewish men prompted the February strike in 1941, which the Germans violently suppressed. Deportations began in July 1942 [7]. Our inference is that an occupation narrative centred only on national suffering and resistance conceals these differences in vulnerability.
Resistance nevertheless mattered. The Nationaal Archief describes underground newspapers, intelligence work and assistance to people in hiding as central activities. Its guide identifies false identity documents, hiding addresses and food coupons as practical necessities 8. Onderduiken means going into hiding; food distribution could determine whether hiding remained possible.
| Turning point | What happened | Why it matters |
|---|---|---|
| 10 to 15 May 1940 | Invasion, the Rotterdam bombing and formal capitulation [5]. | Establishes how occupation began. |
| From 1941 | Political parties other than the NSB were banned [6]. | Shows the removal of democratic political life. |
| 17 September 1944 | The railway strike began alongside Operation Market Garden 9. | Connects military strategy with the approaching food crisis. |
| September 1945 | Parliament met again [6]. | Civil reconstruction continued after military liberation. |
This chronology also prevents a common compression: the Hunger Winter was a particular catastrophe near the end of the occupation, not a description of food conditions throughout the entire occupation.
What caused the Dutch Hunger Winter?
The famine arose from occupation policies and a collapsing distribution system, intensified by military operations, fuel shortages and freezing waterways. The railway strike and German retaliation were important triggers, but neither explains the whole crisis alone [9]10.
On 17 September 1944, approximately 30,000 railway employees stopped work after the government in exile broadcast its call. The strike was intended to obstruct German military transport during Operation Market Garden, the Allied attempt to secure a route across the major rivers [9].
When the Allied advance failed to break through at Arnhem, much of the west remained occupied. German restrictions on food transport then hit cities dependent on supplies from agricultural areas [9][10].
A temporary embargo had consequences beyond its duration
Historian Ingrid de Zwarte, interviewed by NEMO Kennislink, challenges the simplified account of an uninterrupted German food blockade lasting until liberation. She reports that restrictions on shipping were partly lifted after approximately three weeks and fully lifted after approximately six weeks. Fuel shortages, dangerous transport routes and the continuing railway strike still obstructed supply [10].
This distinction changes the explanation without removing German responsibility for occupation and punitive restrictions. An administrative decision permitting transport could not restore the boats, fuel, security and distribution capacity needed to feed the cities. This is our inference from the documented sequence [9][10].
De Zwarte's historical account treats the crisis as a problem involving occupying authorities, Allied decisions, households and community organisations. Its central question is how a modern society confronted famine, including the actions that prevented an even greater disaster 11.
Why the west suffered especially badly
The famine map followed dependence on incoming food and access to transport. NIOD identifies cities in North Holland, South Holland and Utrecht as particularly affected, while describing hunger journeys towards the north and east [1].
This was not a clean division between a hungry west and an unaffected remainder. Rather, the geography explains why a city resident might travel towards an agricultural district seeking food. The south's earlier liberation also created different military and administrative circumstances [9][11].
The lesson is about access: food can remain somewhere within a country while particular populations lose the means to obtain it. A national harvest figure alone would therefore be an inadequate measure of what an urban household could eat.
How cold was the Dutch Hunger Winter?
There was severe frost, especially late in January 1945, but the winter was not continuously freezing. KNMI describes a winter of contrasts, followed by unusually mild weather in February 12.
The Dutch meteorological institute reports minus 13°C at De Bilt on 26 January 1945 and minus 18°C at Hoorn the following day. Snow covered the ground at De Bilt for fourteen days during January [12].
Those are dated observations at particular locations. They are not a national winter average or the temperature experienced inside every unheated home.
KNMI dates the definitive thaw to 31 January. Early February brought temperatures of about 9°C to 10°C, and the month's average was approximately 3°C to 3.5°C above normal across most of the country [12]. We retain KNMI's comparison without assigning it a modern reference period that its article does not specify.
Why weather mattered without explaining everything
Frozen inland waterways and snow obstructed food movements, including supplies across the IJsselmeer. KNMI explicitly connects the late-January conditions with disappointing deliveries and coupons that could no longer obtain food [12].
The distinction between cold and famine matters. A thaw can reopen a route, but it cannot automatically repair a transport network or replenish exhausted household reserves. This is our inference from the transport history and the meteorological chronology [10][12].
Heating and cooking were also linked. The Verzetsmuseum documents improvised stoves, tree cutting and the dismantling of wood from empty buildings and street infrastructure for fuel 13. A household needed both something to eat and the means to prepare it.
The weather record therefore supports accounts of acute physical suffering while correcting the image of an uninterrupted deep freeze. For historical readers, the useful question is when cold intensified an existing emergency, rather than whether weather alone caused the famine.
How many people died, and how did families survive?
The exact death toll is unknown. The most defensible short answer is an estimated tens of thousands, followed by an explanation of what each estimate counts [2].
A death explicitly registered as starvation differs from an excess death during famine. Undernutrition can contribute to deaths recorded under another immediate cause. Conversely, an increase in deaths during wartime cannot automatically be assigned entirely to food shortage.
NIOD's specialist explanation puts these competing approaches side by side [2].
| Figure reported | Population or definition | How to read it |
|---|---|---|
| More than 22,000 | Direct and indirect victims in the western Netherlands, the conclusion NIOD attributes to Lou de Jong and also to De Zwarte [2]. | A historical estimate, not a complete individual register. |
| 16,000, plus a rural addition | Trienekens's estimate of excess urban deaths in the western Netherlands during the first half of 1945 compared with the same period a year earlier [2]. | A different baseline and geographic scope. |
| Approximately 20,000 | De Zwarte's rounded famine-related mortality figure in her book's introduction [11]. | An approximate overview figure. |
These figures should not be averaged. They are answers built from different definitions and evidence, not independent measurements of an identical quantity.
Survival depended on resources and relationships
People undertook hongertochten (journeys to obtain food), often walking or cycling towards rural districts. Children were also sent away from cities to recover in the countryside [1].
Official ration figures also need a defined period. The Amsterdam cohort profile describes allowances of 400 to 800 kcal per person per day during the famine [3]. De Zwarte's introduction reports less than 370 kcal just before the German surrender in May 1945 [11]. A broad range and a late-crisis minimum should not be presented as rival measurements of the same day. Neither tells us precisely what every household consumed.
The Verzetsmuseum documents tulip bulbs and sugar beets as emergency foods, alongside household efforts to obtain fuel. Its account reports approximately 50,000 undernourished city children placed with rural families through the cooperating churches [13]. This is a reported historical estimate, not our reconstruction of every evacuation.
De Zwarte's research also identifies neighbourhood, church and workplace initiatives that supplemented official provision. In her analysis, people who lacked money, mobility or a social network were particularly vulnerable [10].
Our inference is that survival was partly a question of connections: whether somebody could travel, exchange possessions, reach a doctor or be noticed by a relief organisation. Describing the winter solely as individual desperation misses the collective work that helped people survive.
The memories and the statistics answer different questions. A child's recollection can illuminate a household's suffering; mortality estimates ask how the crisis changed deaths across a population. Neither substitutes for the other.
What was the Dutch famine birth cohort study?
There was more than one Dutch famine study. Researchers used hospital birth records, population registers, military examinations and sibling comparisons, so a claim about “the study” needs a named cohort and an outcome [3].
The Amsterdam Dutch Famine Birth Cohort contains 2,414 people born alive as term singletons at the Wilhelmina Gasthuis between November 1943 and February 1947. Adult follow-up began in 1994. Exposure was defined using recorded official rations and pregnancy timing, including a threshold below 1,000 kcal per day across a thirteen-week gestational period [3].
The Dutch Hunger Winter Families Study is a separate project. Its underlying hospital series comprises 3,307 births across clinics in affected cities. The dataset catalogue dates its later tracing and examinations to 2003 to 2005 14. A birth-record series is not the number examined in every subsequent paper.
| Research population | Starting material | Main comparative strength |
|---|---|---|
| Amsterdam Dutch Famine Birth Cohort | 2,414 eligible term singleton births at one maternity hospital [3]. | People born before the famine or conceived afterwards provide comparisons. |
| Dutch Hunger Winter Families Study | A hospital series of 3,307 births across three cities [14]. | Later analyses can include unexposed siblings as well as hospital time controls 15. |
| Military and psychiatric register studies | Examination and health-register records, rather than the same hospital follow-up sample [15]. | Different coverage and outcomes, with their own selection limits. |
Why the setting is scientifically valuable
The famine had a relatively sharp time boundary within a population whose nutritional circumstances changed substantially. Recorded rations and maternity records made it possible to distinguish exposure at different stages of pregnancy [15].
Here, calories means kilocalories, written kcal, the dietary energy unit. An official allowance is not a measured personal intake: food obtained privately, household sharing and unequal access to supplements could change what somebody actually ate. A review of famine studies identifies this reliance on group-level exposure measures explicitly [15].
Timing also changes who belongs in an exposed group. Babies born after liberation could have been exposed early in pregnancy. Conversely, a person who experienced hunger as a schoolchild does not belong to a prenatal exposure group merely because they survived the same famine.
The original Amsterdam cohort excluded stillbirths, twins and premature births, while later examination depended on survival and participation [3]. Those design choices make comparisons more focused, but limit generalisation. The studies describe selected survivors; they cannot capture every biological consequence of the crisis.
What happened to Dutch Hunger Winter babies later in life?
Prenatal exposure was associated with several later health differences, but findings vary by outcome, timing and cohort. Positive results should be read alongside null findings, rather than combined into a universal prediction of disease.
A glucose study examined 702 adults. It found higher glucose concentrations after a glucose challenge, particularly among those exposed late in gestation 16. That is a specific metabolic result, not evidence that every participant developed diabetes.
The coronary disease literature illustrates why precise comparison matters 1718.
| Outcome and study | Reported comparison | What the result supports |
|---|---|---|
| Glucose tolerance, 1998 | After late-gestation exposure, the two-hour glucose concentration was 0.5 mmol/L higher; 95% confidence interval 0.1 to 0.9 mmol/L [16]. | An association with poorer glucose handling in that sample. |
| Coronary heart disease, 2000 | Prevalence after early-gestation exposure was 8.8%, compared with 3.2% in unexposed participants; adjusted odds ratio 3.0, with a 95% confidence interval of 1.1 to 8.1 [17]. | A positive association with substantial statistical uncertainty. |
| Coronary artery disease, 2012 | A separate study found a hazard ratio of 1.17, with a 95% confidence interval of 0.73 to 1.88 [18]. | No clear increase established in that study. |
An odds ratio and a hazard ratio describe different comparisons and should not be treated as interchangeable. Neither estimate is a percentage-point increase in an individual's lifetime probability of illness.
The later coronary study included 407 prenatally exposed people, 344 time controls and 324 sibling controls. It examined cardiac history and multiple clinical and electrocardiographic measures [18]. Its result does not erase the earlier association, but prevents a confident claim that every Dutch famine cohort demonstrated the same coronary effect.
Research continues beyond a single explanation
A study published in 2026 examined genetic influences on birth weight in the Families Study. It analysed 283 people exposed in mid-to-late gestation, 145 exposed early and 161 unexposed controls. The investigators reported that famine exposure later in pregnancy constrained the relationship between a genetic birth-weight index and actual birth weight 19.
They also found associations between being lighter than genetically predicted and later metabolic risk markers [19]. This suggests that the interaction between development, inherited variation and environment remains a live research question.
Our interpretation is that the evidence supports lasting vulnerability in some groups, while leaving considerable uncertainty about mechanisms and individual outcomes. The survivors' later lives cannot be read directly from their birth dates.
What does Dutch Hunger Winter epigenetics actually prove?
The research demonstrates an association between prenatal famine exposure and persistent differences in DNA methylation. It does not, by itself, prove that those differences caused later disease or passed unchanged through successive generations [4]20.
In the landmark study published in 2008, researchers compared people exposed around conception with their unexposed same-sex siblings. Across sixty sibling pairs, average methylation at a regulatory region associated with IGF2 was 0.488 in exposed participants and 0.515 in controls, approximately six decades after the famine [4].
The authors reported a 5.2% relative reduction [4]. Our calculation from their published fractions gives a difference of 2.7 percentage points: subtract 0.488 from 0.515 and multiply by 100 [4]. These are different ways of expressing the same comparison.
IGF2 is involved in growth. DNA methylation concerns chemical marks associated with gene regulation, rather than a change in the DNA letter sequence. A subsequent study found both higher and lower methylation at different loci, with differences depending on exposure timing and sex [20].
Persistence, mechanism and inheritance are separate claims
Persistence means a difference can still be detected long after exposure. It does not mean investigators repeatedly observed the same mark throughout somebody's life.
Mechanism asks whether that difference helped produce a later outcome. A study published in 2018 compared 348 exposed participants with 463 controls and investigated methylation as a possible mediator of metabolic differences. The authors explicitly caution that statistical mediation does not establish the biological mechanism 21.
They measured methylation in blood, which is not automatically a substitute for the tissues most relevant to every disease. Our inference is that evidence becomes stronger when exposure, molecular changes and clinical outcomes can be connected through appropriately timed measurements and relevant tissues [21].
Inheritance asks whether an effect was transmitted to descendants through reproductive cells. A study of 360 adult offspring, published in 2013, found greater weight and body mass index among offspring of prenatally exposed fathers, but no corresponding maternal association and no detected difference in reported adult health between the groups 22.
The results came from an online questionnaire. They therefore provide a particular family association, not direct observation of an inherited molecular mechanism [22].
Why grandchildren do not settle the question
A pregnant woman's fetus is exposed to the conditions in her body. The fetus's developing reproductive cells can also be directly exposed. Under the terminology explained in a Clinical Epigenetics review, the great-grandchild generation is the first beyond direct exposure in that maternal pregnancy scenario 23.
Consequently, a finding in grandchildren can be important without demonstrating transmission through an entirely unexposed generation. Shared circumstances and other family pathways also need consideration [23].
This is the practical distinction behind the scientific debate. A durable methylation association, a higher rate of a health outcome and reproductive inheritance require different evidence. The Hunger Winter research has made major contributions to the first questions; the studies reviewed here do not settle the last.
How did the Hunger Winter end, and who liberated the Netherlands?
Food relief began before the national liberation date, and liberation unfolded regionally. Air drops were important, but shipping, road transport and local distribution were also necessary 24.
The Dutch military history institute dates the first Operation Manna drops to 29 April 1945. Its account describes negotiated access for British and American food operations, named Manna and Chowhound respectively, while German forces still occupied the west [24].
The RAF Museum independently confirms the first Manna date and describes multinational crews, including Polish, Canadian, Australian, New Zealand and Dutch airmen 25. This was an international relief effort.
Food had to reach households
NIMH also records Operation Faust road deliveries beginning on 2 May 1945 and the arrival of ships in Rotterdam three days later [24]. The relief system therefore depended on several transport routes.
The Verzetsmuseum distinguishes earlier Swedish flour shipments, arriving by ship in January 1945 and used for bread distributed in February, from the later airborne operations [13]. Memories of Zweeds wittebrood (Swedish white bread) should not automatically be labelled memories of air drops.
Our inference is that aircraft photographs capture a turning point, while the full explanation requires the less visible work of collecting, moving and distributing food.
Canadian leadership within a wider Allied campaign
Veterans Affairs Canada describes the First Canadian Army's major role in the liberation and its international composition. British and Polish formations served within it, with other Allied nationalities also represented at different times 26.
This explains the strong Dutch association between Canada and liberation while preserving the wider coalition's contribution. “The Canadians liberated the Netherlands” is a useful starting point, but an incomplete description of every campaign and locality.
German forces covered by the surrender at Lüneburg capitulated on 4 May 1945; the agreement took effect at 08:00 on 5 May. The Dutch national war-history portal distinguishes that surrender from the implementation arrangements associated with Wageningen 27.
Local chronology remained uneven. The Nationaal Militair Museum records Canadian arrival on Texel on 20 May and the departure of the last Germans from Schiermonnikoog on 11 June 1945 28. A national date and a town's or island's liberation date need not be identical.
The Netherlands annually celebrates Bevrijdingsdag (Liberation Day) on 5 May 29. On 4 May, Dodenherdenking (Remembrance Day) includes two minutes of silence at 20:00 30. Commemoration and celebration are connected, but have different purposes.
What this means for readers
Begin a family history with a place and a life stage. Establish where the person lived, whether they were already born, and whether the account concerns hunger, hiding, forced labour or liberation. The famine's geography and the studies' exposure definitions make these distinctions essential [1][15].
For archival research, NIOD's Hunger Winter guide points towards diaries, correspondence, photographs and other collections [1]. The Nationaal Archief's resistance guide explains how to investigate people and organisations, while warning that clandestine groups did not keep ordinary membership records [8]. An unsuccessful name search is therefore not conclusive.
When reading a scientific headline, identify the cohort, the comparison group and the measured outcome. A study of glucose handling does not answer the same question as a questionnaire about descendants' health [16][22]. Check whether a percentage describes disease prevalence, a relative association or a methylation difference.
Useful Dutch reading vocabulary includes bezetting (occupation), verzet (resistance), voedselbonnen (food coupons) and gaarkeuken (communal kitchen). Pairing museum material with personal accounts can make these terms concrete. Readers building a history-based study routine can use our guide to learning Dutch and directory of Dutch learning resources.
For commemorative visits, recognise the silence on 4 May and the celebrations on 5 May [29][30]. Use local histories to understand what liberation meant in the specific place you visit. Leave room for loss alongside relief, and for people whose experiences do not fit a single national narrative.
What we could not verify
We could not establish an exact individual count of famine deaths. NIOD explicitly describes the evidence and attribution problems; the historical estimates above should retain those qualifications [2].
We could not reconstruct individual calorie intake from official allowances. The medical literature uses exposure measures based on period and place, rather than complete personal food diaries [15].
The studies reviewed do not establish that a particular descendant's illness was caused by the famine, or prove a continuous inherited epigenetic mechanism through unexposed generations [21][22][23].
We did not verify a complete future programme of Liberation Day events. The annual commemoration dates are established, but individual activities and local arrangements require their organisers' current information [29][30].