Since i am in my 30s now what foods and drink is there to have in your body to be healthy and what to avoid?

Generally, a variety: Healthy diets have natural foods that take time to chew but contain few calories. Examples include carrots, celery, and leafy lettuce (little or no salad dressing). When shopping for fruits, buy small ones no bigger than a tennis ball, as fruits have sugar. Drinks without calories include water and green tea. Surely avoid sugar or simple starch calories. Eat some protein with each meal.