Brenda Khan
The impact of diet on the epigenome is an emerging field of study. The diet and lifestyle choices of an individual can have a profound impact on their health, and the epigenome is a key mediator of this relationship. Nutritional epigenetics is a recent subfield of epigenetics that explores how dietary components influence epigenetic modifications and phenotypes. Environmental factors, including diet, can induce epigenetic changes that persist into adulthood, and in some cases, across generations. For example, a mother's diet during pregnancy can shape the epigenome of her offspring. These epigenetic changes are often reversible, and a better understanding of this relationship can inform therapeutic approaches and personalized diets to improve health and longevity.
| Characteristics | Values |
|---|---|
| Reversibility of epigenetic changes | In theory, epigenetic changes are reversible. |
| Reversibility of DNA methylation changes | DNA methylation changes are reversible. |
| Impact of diet on epigenome | Diet can trigger epigenetic modifications to genes throughout the lifespan. |
| Impact of diet on DNA methylation | Dietary components can activate sirtuin 1, a NAD+-dependent HDAC, which can delay or reverse physiological changes associated with aging through effects on DNA methylation. |
| Role of specific dietary components | Resveratrol, curcumin, and epigallocatechin gallate (EGCG) from green tea have anti-inflammatory and anti-cancer properties. |
| Role of maternal diet | A mother's diet during pregnancy and the infant's diet can affect the offspring's epigenome into adulthood. |
| Impact of methyl-deficient diet | A methyl-deficient diet decreases DNA methylation, but changes are reversible when methyl is added back to the diet. |
| Impact of environmental factors | Environmental factors such as behaviors, nutrition, and exposure to chemicals and pollutants can influence the epigenome. |
| Role of bioactive food components | Bioactive food components can trigger protective epigenetic modifications and may be incorporated into a therapeutic "epigenetic diet." |
| Impact on health | Dietary patterns and bioactive food components can positively impact overall health and potentially prevent or treat diseases such as obesity, diabetes, cancer, and mental disorders. |
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What You'll Learn
The impact of diet on the epigenome is a recent discovery
The diet of a pregnant mother can have a profound effect on the epigenome of her offspring. Animal studies have shown that a diet with too little methyl-donating folate or choline before or just after birth causes certain regions of the genome to be under-methylated for life. Folate is an important source of one of the carbon groups that is key to methylation, making it essential for the developmental process. In humans, a mother's diet during pregnancy and an infant's diet can affect their epigenome into adulthood. For example, a Dutch famine during World War II caused epigenetic changes in the children exposed to it in utero, resulting in a higher rate of chronic conditions such as diabetes, cardiovascular disease, and obesity compared to their siblings. Similarly, studies on mice have shown that a methyl-deficient diet decreases DNA methylation, but these changes are reversible when methyl is added back into the diet.
The diet of an adult can also affect their epigenome. For example, a Western-type diet rich in processed foods and high-sugar drinks was found to limit the production of microbial short-chain fatty acids (SCFAs) and lead to alterations in hepatic gene expression. In contrast, a low-carb ketogenic diet was shown to rescue hippocampal memory defects in a mouse model of Kabuki syndrome. Dietary phytochemicals such as tea polyphenols, genistein, sulforaphane, resveratrol, curcumin, and others have been demonstrated to be effective against cancer and to act through epigenetic mechanisms that affect the epigenome.
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Dietary restrictions can extend lifespan
Dietary restrictions without malnutrition have been shown to extend lifespan in several models. Calorie restriction has an anti-inflammatory effect through the inhibition of critical genes, including NF-κB. This results in a delay or reversal of some of the physiological changes associated with aging, such as DNA methylation.
The impact of dietary restrictions on lifespan has been observed in various organisms, including genetically diverse mice, worms, and non-human primates. For example, a study on the small roundworm C. elegans found that dietary restriction extended lifespan through autophagy, or cellular recycling, in the intestine. Autophagy breaks down cell parts, eliminating unnecessary or broken machinery and providing building blocks for new cell components.
In addition, dietary restriction can have beneficial metabolic effects in aged mice, improving their metabolic health. Furthermore, specific dietary patterns, such as a low-protein diet, have been linked to lifespan extension.
While genetics plays a significant role in determining lifespan, dietary restriction interventions can still positively impact health and longevity. The precise mechanisms behind these benefits are still being explored, but they involve multiple molecular pathways and nutrient-sensing geroprotective signaling pathways.
Overall, dietary restrictions can extend lifespan, and further research is ongoing to understand the complex interplay between dietary patterns, genetics, and longevity.
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A mother's diet can shape her child's epigenome
A mother's diet can indeed shape her child's epigenome. The diet and lifestyle of a pregnant woman, as well as the diet of an infant in the first years of life, can shape the child's lifelong health and influence their risk of developing diseases in adulthood. This is because the epigenome is first established during early development, and a mother's diet during pregnancy can affect the child's epigenetic outcome.
Nutrition is a key environmental factor that can affect cellular epigenetics and, therefore, human health. Bioactive food components and specific nutrients can reversibly alter DNA methylation status, histone modifications, and chromatin remodelling, subsequently altering gene expression and impacting overall health. For example, a methyl-deficient diet decreases DNA methylation, but these changes are reversible when methyl is added back into the diet. Folic acid, B vitamins, and SAM-e are key components of the methyl-making pathway, and diets high in these methyl-donating nutrients can rapidly alter gene expression, especially during early development. Animal studies have shown that a diet with too little methyl-donating folate or choline before or just after birth causes certain regions of the genome to be under-methylated for life, with detrimental consequences for health.
Research has shown that the "intrauterine environment" affects many things concerning our bodies. The foods we eat, our physical activity, the chemicals we are exposed to daily, and the environment we live in can potentially influence a baby's epigenome and induce metabolic and developmental adaptations. These influences can permanently change and mark the baby's physiology and metabolism, increasing the risk for disorders, both mental and physical. For example, a diet high in saturated fats, red meats, and carbs may cause damage to a child's nervous system via epigenetic mechanisms.
Maternal undernutrition, seasonal diets, low-protein diets, high-fat diets, and synthetic folic acid supplement use are all nutritional stressors that can epigenetically affect target genes and their outcomes. For instance, in a study conducted on pigs, mothers were fed a low-protein diet one month before fertilisation and during pregnancy. The study showed that the G6PC promoter was hypomethylated in male offspring, together with increased methylation of H3K4 in the G6PC promoter in the liver. This caused the activation of the G6PC gene in males, which is linked to the development of hyperglycaemia and diabetes in adulthood.
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Dietary agents can affect epigenetic processes
Bioactive dietary compounds, such as isothiocyanates in broccoli, genistein in soybeans, and resveratrol in red grapes, have been shown to modify the epigenome and lead to beneficial health outcomes. For instance, resveratrol has antioxidant, anti-inflammatory, and anti-cancer properties. It impacts signaling pathways that control cell division, cell growth, apoptosis, angiogenesis, and tumor metastasis.
In adults, a methyl-deficient diet decreases DNA methylation, but these changes are reversible when methyl is added back into the diet. The diet of a pregnant woman can also affect the epigenome of her child, as seen in animal studies where a methyl-deficient diet before or after birth caused certain regions of the genome to be under-methylated for life. Maternal nutrient supplementation with methyl-rich foods can counteract the negative effects of exposure to harmful chemicals like bisphenol A (BPA), resulting in healthier offspring.
Additionally, dietary restriction without severe nutritional deprivation has been shown to extend lifespan by having an anti-inflammatory effect through the inhibition of critical genes. Dietary components, such as resveratrol, can activate sirtuin 1, a NAD+-dependent HDAC, which mediates some of the effects of dietary restriction and can delay or reverse physiological changes associated with aging through DNA methylation.
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Bioactive food components can trigger protective epigenetic modifications
Bioactive dietary compounds are thought to be beneficial, and mounting evidence suggests that commonly consumed bioactive dietary factors can modify the epigenome. These dietary agents can affect epigenetic processes and are involved in processes, including the reactivation of tumour suppressor genes, the initiation of apoptosis, the repression of cancer-related genes, and the activation of cell survival proteins in different cancers. For instance, isothiocyanates, found in broccoli, have been reported to increase histone acetylation in mouse erythroleukemia cells.
Bioactive food components may also overcome the negative impact of negative life behaviours, such as smoking or exposure to certain chemicals. For example, resveratrol, a type of natural phenol present in grape skins, has antioxidant, anti-inflammatory and anti-cancer properties. It impacts signalling pathways that control cell division, cell growth, apoptosis, angiogenesis and tumour metastasis.
A better understanding of the epigenetic effects and the signalling pathways activated by bioactive food components would aid in assessing the role and potential benefit of nutrients on our health.
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Frequently asked questions
The epigenome is formed through a lifetime of experiences, beginning in the womb. It may provide a wealth of information about how to eat better.
Dietary agents and non-nutrient components of fruits and vegetables can affect epigenetic processes. Nutritional compounds have epigenetic targets in cancer cells and can alter normal epigenetic states as well as reverse abnormal gene activation or silencing.
The effects of diet on the epigenome can have significant implications for our long-term health and life expectancy. For example, a methyl-deficient diet decreases DNA methylation but the changes are reversible when methyl is added back into the diet.
Bioactive food components such as polyphenols (resveratrol and curcumin) and epigallocatechin gallate (EGCG) from green tea can support the body's natural defences against inflammation and support cardiovascular health.
The knowledge of the effects of diet on the epigenome can be used to develop a personalised nutrition plan. Nutrigenomics is a field where nutritionists look at an individual's methylation pattern to design a personalised diet.
