Can my genes change during my life?

The DNA sequence you were born with is largely fixed; the actual letters of your genes do not rewrite themselves as you live. But which genes are switched on or off, and how strongly, can change. This control layer is called epigenetics. Through chemical tags like methylation that sit on top of DNA, your body dials gene activity up or down in response to diet, stress, sleep, smoking, exercise and your wider environment. So the same genes can behave differently at different points in your life.

Some of these epigenetic changes are temporary and reversible; others can persist. There is even evidence that environment, including nutrition during pregnancy, can influence gene activity in the next generation, a point of real relevance in India given widespread maternal undernutrition and its links to later metabolic risk in children. This is one reason early-life nutrition is taken so seriously.

The honest takeaway: you cannot swap out the genes you inherited, but you have real influence over how they are expressed through everyday choices. That is empowering and grounding at once. It means lifestyle is not pointless in the face of genetics, far from it, but it also means there is no magic switch. Steady habits around food, movement, sleep and stress are the practical tools that shape your epigenetics over a lifetime.