India, May 5 -- If you are between 25 and 45, this may be the right time to start paying closer attention to habits that can shape your health for decades. Dr Saurabh Sethi, Harvard and Stanford-trained gastroenterologist and hepatologist, says poor eating patterns, stress, lack of sleep and inactivity can quietly affect digestion and raise the risk of long-term health issues. He shares seven ways for longevity. "Your brain and body recover during sleep," says Dr Sethi, adding that hormones, metabolism, memory and mood are regulated at night. Chronic sleep deprivation has been linked to obesity, depression and heart disease. Muscle mass is one of the strongest predictors of healthy ageing. "Strength training improves metabolism, insulin sensitivity, and joint stability," he explains, adding that it can help prevent osteoporosis later in life. Calling stress management a lifelong health skill, Dr Sethi says chronic stress increases cortisol and inflammation in the body. "High cortisol raises the risk of heart disease, weight gain, hormone disruption, anxiety, and burnout," he shares. "Your habits now shape your risk of diabetes and heart disease later," he says. His advice: focus on whole foods, regular movement, adequate sleep and limiting ultra-processed foods. Strong relationships are among the biggest predictors of long-term health. Supportive friends and family can reduce stress and improve mental well-being, while social isolation has been linked to depression, heart disease and shorter life expectancy. Reading keeps the brain active and improves focus, learning and critical thinking. He also stresses daily movement, saying, "Your body is designed to move." "Alcohol affects sleep, recovery, liver health, and brain function," he says, advising people to avoid it or be intentional about how much and how often they drink....