Eat healthily:Healthy eating means having a balanced diet. Eat a lot of fruit and vegetables,as well as basic foods like rice,cereal,and potatoes. Drinking plenty of water is also good for you. Chicken and fish are better than fatty red meat. Don't just eat healthily,try to reduce the amount you eat.As you get older,your body needs less food. If you eat the same as when you were young,you will get fatter. It's good to have a healthy appetite. but try to avoid eating large amounts.