by admin-blog-kh | November 2, 2026 5:56 am
Epigenetics refers to how lifestyle and environmental factors influence the way genes are turned “on” or “off” without changing the DNA itself. While DNA acts like a fixed recipe book, epigenetics determines which recipes are used at a given time. Factors such as diet, stress, physical activity, toxins, and ageing can all affect gene expression. One key mechanism is DNA methylation, where chemical groups attach to DNA and silence specific genes; this process can also be reversed. Epigenetics plays an important role in health and disease, influencing conditions like cancer, diabetes, and heart disease. Nutrition is especially significant, as nutrients like folate, choline, and B vitamins support these gene-regulating processes. In populations like South Asians, historical factors and lifestyle contribute to epigenetic patterns linked to a higher diabetes risk. Overall, epigenetics highlights how daily choices and environment can shape long-term health and even ageing.
DNA encodes your genes, which act as instructions for all biological functions in your body. Epigenetics is the study of how a person’s behaviour and environmental factors influence how genes are expressed. The term “epigenetics” combines the Greek prefix “epi-” (meaning “over”) with genetics to describe mechanisms that regulate gene activity without altering the underlying DNA.
Think of your DNA as a recipe book. The recipes are printed and do not change. They tell your body how to grow new cells, repair proteins, and regulate bodily functions. Epigenetics influences which genes are expressed essentially deciding which recipes are “cooked” at a given time. Diet, stress, physical activity, ageing, and exposure to environmental toxins can all change the way the body functions. Studies show that pregnant mothers exposed to famine conditions are more likely to have children who develop heart disease, schizophrenia, and type 2 diabetes later in life.
The study of epigenetics has opened up a new direction in medicine. Understanding how environmental factors affect gene activation helps scientists and doctors devise innovative treatments for diseases like cancer, blood disorders, heart disease[1], neurodegenerative diseases, metabolic disorders, and autoimmune conditions[2].
According to nutritionists, diet is one of the most important epigenetic factors. The foods you eat provide the metabolic fuel that supports epigenetic enzyme activity. Enzymes are biological catalysts made of proteins. They work on a lock-and-key mechanism, whereby they act only on specific biological substrates.
Epigenetic enzymes are involved in DNA methylation. The addition of a methyl group to a specific nucleotide deactivates that gene, preventing certain proteins from being produced. This is a reversible process demethylation can reactivate dormant genes. The raw materials required for these cellular processes come from the food you eat.
Studies show that dietary deficiencies in nutrients like folate and polyphenols can affect DNA methylation, altering gene activity and contributing to conditions such as metabolic disorders and cancer. Adequate intake of these nutrients over time may help restore balance[3].
India’s diabetes problem also has an epigenetic component. In addition to sedentary lifestyles, studies suggest that historical famines have contributed to what is often described as a “thrifty genome”. This means that populations adapted to survive scarcity may be less suited to modern environments of abundance.
This, unfortunately, means that the body may respond more sensitively to calorie intake, leading to rapid weight gain or loss and a higher predisposition to type 2 diabetes. South Asians also appear to have higher levels of DNA methylation, meaning more genes may be switched off.
The link between methylation and diabetes is strong enough that it has been proposed as a potential screening tool for early detection. However, more research is needed to establish clear cause-and-effect relationships.
Diet has a significant impact on cellular ageing. Biological age reflects how quickly your cells, tissues, and organs are ageing, based on accumulated molecular damage. This can differ from chronological age.
For example, a 65-year-old who consistently uses sun protection and follows a predominantly Mediterranean diet may have a biological age closer to 55. In contrast, a 40-year-old smoker with a poor diet may have a biological age of 55.
In a study conducted at Stanford, identical twins were given different diets over eight weeks to assess the impact of food on epigenetics. One followed a plant-based diet, while the other consumed an animal-based diet. After eight weeks, the twin on the plant-based diet showed significant improvements in several biomarkers. Researchers suggested that lower caloric intake and higher fibre consumption[5] contributed to these changes. The study also indicated that foods like fish and eggs may support healthy gene expression and slow ageing.
Epi-nutrients are compounds in food that influence epigenetic activity. For DNA methylation, the body requires methyl donor compounds. The primary methyl donor is S adenosylmethionine (SAMe), which is synthesised from nutrients like folate, choline, betaine, and certain B vitamins.
Nutritionists believe maintaining the right balance of methyl groups is essential not too many, not too few. Here are some foods to include (in moderation):
In addition, several compounds influence epigenetic enzyme activity. These include cur cumin (from turmeric), rosemary, green tea, anthocyanins found in berries and beetroot, and allicin in garlic. Including these in small amounts as part of a balanced diet over time can support overall health[6].
Your diet plays an important role in supporting gene function, metabolic health, and healthy ageing. A balanced diet rich in leafy greens, whole grains, fruits, nuts, and protein sources can provide essential nutrients for overall well-being. For personalised nutritional guidance and preventive healthcare[7], Kauvery Hospital, with branches in Chennai, Hosur, Salem, Tirunelveli, and Trichy, offers expert medical care to help you make informed choices for long-term health.
Epigenetics refers to changes in how genes are switched on or off without altering the underlying DNA sequence. Environmental and lifestyle factors, including diet, stress and physical activity, can influence these processes.
Diet provides nutrients that support enzymes involved in regulating gene activity. Nutrients such as folate, choline and B vitamins contribute to processes such as DNA methylation, which influences gene expression.
DNA methylation is an epigenetic process in which methyl groups attach to DNA and influence gene activity. It can regulate whether certain genes are expressed and plays an important role in normal cellular functions.
Folate, choline, betaine, methionine and certain B vitamins support the body’s methylation processes. Foods such as leafy greens, eggs, fish, beans, lentils and whole grains provide these nutrients.
Nutrition and other environmental factors can influence epigenetic patterns involved in metabolic processes. Research is exploring how these changes relate to type 2 diabetes risk, including in South Asian populations. However, epigenetics is only one part of a complex relationship involving genetics, lifestyle and environment.
Chronological age refers to the number of years a person has lived. Biological age reflects the condition of the body’s cells and tissues and may differ from chronological age due to factors such as lifestyle, environment and accumulated cellular changes.
Leafy greens, berries, turmeric, garlic, green tea and rosemary contain nutrients or plant compounds being studied for their influence on epigenetic processes. Including a variety of these foods in a balanced diet supports overall nutritional health.
Some epigenetic changes are reversible, and lifestyle factors such as nutrition and physical activity may influence gene regulation. However, not every epigenetic change can be reversed through dietary changes, and specific foods should not be considered treatments for genetic or metabolic conditions.
Kauvery Hospital is globally known for its multidisciplinary services at all its Centers of Excellence, and for its comprehensive, Avant-Grade technology, especially in diagnostics and remedial care in heart diseases, transplantation, vascular and neurosciences medicine. Located in the heart of Trichy (Tennur, Royal Road and Alexandria Road (Cantonment), Chennai (Alwarpet, Radial Road & Vadapalani), Hosur, Salem, Tirunelveli and Bengaluru, the hospital also renders adult and paediatric trauma care.
Chennai Alwarpet – 044 4000 6000 • Chennai Radial Road – 044 6111 6111 • Chennai Vadapalani – 044 4000 6000 • Trichy – Cantonment – 0431 4077777 • Trichy – Heartcity – 0431 4077777 • Trichy – Tennur – 0431 4022555 • Maa Kauvery Trichy – 0431 4077777 • Kauvery Cancer Institute, Trichy – 0431 4077777 • Hosur – 04344 272727 • Salem – 0427 2677777 • Tirunelveli – 0462 4006000 • Bengaluru – 080 6801 68011
Source URL: https://www.kauveryhospital.com/blog/family-and-general-medicine/how-diet-influences-epigenetics/
Copyright ©2026 Kauvery Blog unless otherwise noted.