Anisha Shukla; University of California, Berkeley
Cite as: Shukla, Anisha. 2026. “What Calories Miss: Rethinking the Biological, Cultural, and Policy Dimensions of Food Aid”. Food-Fueled. doi:10.57912/32180625.
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Introduction: From Calories to Consequences
Preventing famine has always been the driving force behind international food aid policy. Success in humanitarian disasters is typically evaluated by aid organizations, including the World Food Programme, through short-term measures, such as the amount of food delivered or the number of calories people receive per day (WFP 2025). As survival hinges on obtaining enough calories as soon as possible, this strategy has saved millions of lives (Rowlatt 2016; Hutchinson, 2025). However, this approach is complicated by new epigenetic research that suggests what people eat, or are forced to eat, can affect not just individuals, but their children and even grandchildren. Diet, in this sense, is not just fuel. It is a biological signal that changes gene expression (Silberman, 2024). From this perspective, food aid is both a humanitarian initiative and a long-term biological force.
This paper argues that because the effects of malnutrition can extend across generations, international food aid policy needs to go beyond a calorie-centered approach and include long-term nutritional quality. Using epigenetic data from past famines and current nutrition research, this paper studies how malnutrition and diet composition leave molecular “memories” that affect growth and the risk of metabolic diseases. These findings are then compared to global food aid practices by examining interventions like food fortification, micronutrient supplementation, and biofortified crops. Finally, this review reflects on the idea of “inherited taste,” suggesting that dietary culture is passed down both socially and biologically. This realization has important implications for the design and effectiveness of food aid programs.
Epigenetic Foundations: How Nutrition Shapes Gene Expression
The term “epigenetics” is defined as heritable modifications in gene expression that do not alter the underlying DNA sequence (Merriam-Webster, n.d.). Acting as molecular switches, processes like DNA methylation, histone modification, and non-coding RNA regulation turn genes on or off in response to external stimuli, one of which is nutrition. Nutrients—such as folate, choline, methionine, and vitamin B12—are especially crucial because they supply the methyl groups needed for DNA methylation (Choi and Friso, 2010). Excesses or deficiencies in these nutrients can drastically change epigenetic patterns, therefore affecting pathways related to insulin signaling and stress response.
Moreover, these epigenetic modifications can persist long after dietary circumstances improve (Zeisel, 2009). Studies on non-human subjects have repeatedly shown that prenatal or early-life malnutrition results in altered metabolic phenotypes in adulthood, including reduced glucose tolerance, increased fat storage, and susceptibility to cardiovascular disease (Grzeda et al. 2022). Similar results are increasingly supported by human data, indicating that nutrition is not just a temporary exposure; it is a biological instruction system.
The Dutch Hunger Winter: A Case Study in Intergenerational Memory
As seen in Figure 1, the Dutch Hunger Winter of 1944-1945 is one of the most influential experiments in epigenetic nutrition research. A Nazi blockade in the last year of World War II cut off food supplies to the western Netherlands, resulting in a sudden and severe famine as rations decreased to less than 800 calories a day. The famine was an unusual natural experiment for researchers since it was well-documented, geographically contained, and ended suddenly when food supplies were restored. As the timeline illustrates, researchers were able to classify individuals according to whether they were conceived before, during, or after the famine, and if their fetal development overlapped with early, mid, or late gestation exposure to malnutrition.
Decades later, adults exposed to prenatal famine exposure showed increased risks of obesity, type 2 diabetes, cardiovascular disease, and several psychiatric conditions, such as schizophrenia. These results imply to researchers that early nutritional deprivation has long-lasting biological impacts, even in the face of postwar advances in food supply and healthcare (Rooij et al., 2021). Notably, the timing of exposure to malnutrition is crucial. While individuals exposed during late gestation tended to have lower birth weights and poorer glucose tolerance, those exposed during early gestation were more likely to become obese later in life.
More recent molecular research has shown that people who were exposed to famine before birth still exhibit measurable biological changes years later. Researchers discovered variations in DNA methylation in genes related to growth and metabolism between fetuses during the Dutch Hunger Winter (Silva et al., 2023). To put it simply, in utero, their bodies appear to have been biologically “programmed” to adapt to scarcity. There is increasing evidence from epigenetic research studies on parental diet in animal and human models that suggest some of the consequences of nutritional stress can appear in future generations, indicating that one’s diet may leave lasting genetic imprints (Anih et al., 2025). The Dutch Hunger Winter shows that starvation does not end when food becomes available again, even though scientists continue to debate how widespread or permanent this type of genetic inheritance is.
From Historical Famine to Contemporary Food Aid
Although the environment in which food aid programs function today differs from that of Europe during the Second World War, biological lessons are still applicable. People who depend on charity today more frequently experience long-term food insecurity than short-term famines. In the United States, approximately 17 million households, or 12.8%, experienced food insecurity in 2022, reflecting an ongoing condition rather than a temporary crisis. A similar pattern is seen internationally, with nearly 23% of Canadian households experiencing food insecurity in 2023 (Durocher et al., 2024). In these prolonged conditions, simply providing calories is not sufficient, and the quality of food is just as important as its quantity in low-income communities, conflict areas, and refugee camps where people often rely on outside aid.
However, shelf stability, cost effectiveness, and convenience of distribution sometimes take priority over micronutrient diversity. Many aid packages highlight staple foods like maize, wheat, or rice (Rutledge et al., 2024). Although these basics save people from starvation, they often do not offer enough nutrients to promote normal epigenetic development (Fallaize et al., 2020). A 2022 systematic review by Oldroyd et al. examined the nutritional quality of food parcels provided by food banks in the UK, Canada, U.S., and parts of Europe. Based on national dietary guidelines, individuals are recommended to consume at least five servings of fruits and vegetables a day (NIH, 2021). The parcels provided only 87% of recommended portions, while none met weekly requirements for vitamin D and calcium (Oldroyd et al., 2022).
People may experience “nutrient scarcity” when they rely on dietary aid that gives them adequate calories but lacks essential nutrients for extended periods of time (Wilson et al., 2021). This may affect how genes linked to metabolism are regulated, and when food becomes more abundant, this biological “programming” can raise the risk of long-term conditions like diabetes and obesity (Fernandez-Twinn et al., 2019).
Current Global Food Aid Policy: Progress and Persistent Limitations
Over the last 20 years, the World Food Programme has shifted global food aid strategy from giving people enough calories to emphasize the timing of nutrition and the quality of what they eat (WFP, 2017). Micronutrient adequacy and healthy childhood development are now given priority over simply meeting caloric demands in international frameworks such as the World Food Programme’s nutrition policies, UNICEF’s Maternal and Child Nutrition Strategy, and the World Health Organization’s Global Nutrition Targets (UNICEF, 2024; WHO, 2025). This shift is displayed in Figure 2, where present initiatives increasingly aim to feed populations in ways that promote biological resilience and long-term health.
The widespread adoption of fortified dietary staples (where essential minerals like iodine, iron, folic acid, and vitamin A are added to salt, rice, wheat flour, and other commonly consumed foods) is one important outcome of this change. Fortification is the intentional addition of vitamins and minerals to common foods that people might be lacking (WHO, 2022). Fortification has greatly decreased iodine deficits, anemia, and neural tube abnormalities (Olson, 2021). However, regular access and consumption are still necessary for its effectiveness; it cannot replace a more diverse diet; and in some situations, nutrients degrade during storage and cooking.
To address these limitations, numerous programs, including national vitamin A distribution campaigns, maternal iron-folate supplementation programs, and child nutrition programs in low-income and refugee communities supported by UNICEF and WHO, use targeted micronutrient supplementation (UNICEF, 2022). However, these strategies also face challenges such as limited healthcare access, inconsistent delivery, and adherence issues, particularly in unstable or resource-constrained environments.
Biofortified crops are increasingly considered a more structural option to meet long-term nutritional needs because they directly add micronutrients to food items. In regions with low dietary diversity, such as parts of Sub-Saharan Africa and South Asia, examples like zinc-enhanced wheat, iron-rich beans, and Golden Rice are meant to lessen dependency on continuous external supplementation and provide a long-term solution to improve population health. These techniques have promising benefits as they can reliably improve nutrition, especially in resource-constrained contexts (Elolu and Ongeng, 2020). However, they also bring up significant issues such as the dangers to the environment, worries about corporate dominance of seeds and agricultural authority, farmer autonomy, and societal skepticism regarding genetically modified foods. Fortification, supplementation, and biofortification mark important developments in global nutrition policy and recognition that consuming adequate food is insufficient to sustain good health.
Future Solutions and Policy Recommendations
Recent findings from nutritional epigenetics and developmental biology must be considered in future food assistance programs and nutrition treatments. Growing evidence shows that the formation of taste preferences and dietary tolerances, or “inherited taste,” is influenced by both early life events and biological mechanisms that span generations (Diószegi et al., 2019). Offering nutrient-rich packages is therefore one of the most effective ways to include epigenetic concepts into food aid, particularly for pregnant women, infants, and young children (Indrio et al., 2017). Nutrients involved in DNA methylation and growth pathways, such as folate, vitamin B12, choline, iron, and zinc, should be included in these packages, as they are essential for healthy fetal and early childhood development (Harrison, 2020). Programs could provide ready-to-eat foods, fortified porridge, or targeted supplementation during prenatal visits and early childhood healthcare check-ins to make sure those most at risk get the nutrients needed to avoid long-term metabolic disease, stunted growth, and compromised immune function (Jahan-Mihan et al., 2024).
Additionally, nutritional treatments are more effective when they respect local food cultures and dietary practices rather than imposing foreign foods, as emphasized by the American Medical Association, which notes that individuals are more likely to adopt healthier diets when recommendations align with their cultural traditions (Lubell, 2025). Sustainability and adherence can be improved by combining fortified staples or biofortified crops with regionally popular meals. For example, introducing iron-rich beans or zinc-fortified cereals in locations where these staples are already a part of regular diets increases the likelihood of consistent consumption (Bouis et al., 2024). Additionally, by teaching families about the importance of these nutrients and their role in long-term health, community education programs can assist them in making informed dietary choices (Metcalfe et al., 2022). The nutritional needs of vulnerable people cannot be entirely satisfied by a single intervention; therefore, a hybrid approach that combines biofortification, supplementation, and fortification is important (UNICEF, 2023).
Conclusion
By including epigenetic data into the planning of international food aid, policymakers have the opportunity to move from responsive action to a justice model that recognizes food as a long-term biological investment. Aid that merely feeds hunger without promoting developmental pathways carries the risk of sustaining cycles of metabolic disease, fragility, and inequality across generations. On the other hand, aid that considers food quality, cultural context, and developmental period may interfere with these cycles at the molecular level.
Additionally, policymakers must address the mismatch between short-term aid objectives and long-term biological consequences by reframing food aid through the perspective of epigenetics. It examines whether survival is a sufficient measure of success and whose futures are being determined by actions made today. International food policy must take into consideration the reality that diets have an impact that goes well beyond the current crisis as evidence of their ability to write themselves into genetic memory continues to mount. When food aid is carefully planned, it can become a tool for both survival and generational health: bodies remember what policies often overlook.
Figure 1. Exposure timeline of the Dutch Hunger Winter (1944–1945), adapted from Stein et al. (2021).
Figure 2. Global Nutrition Interventions: From Calories to Nutrient Quality.
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