On average, women and men until 50 years old are recommended to get 2 1/2 cups and 3 cups of vegetables per day, respectively. Adults over the age of 50 should reduce their daily intake by 1/2 cup.However, leaving exact amounts aside, you should get a balanced diet of mostly vegetables, legumes and whole-grain foods, with smaller amounts of fish, fruits, meats, dairy and eggs. More informationDoctors and dieticians recommend losing weight gradually.The most important thing is avoiding junk foods and sweetened drinks such as soda. Try to avoid refined flour and pasta, processed foods, fried foods, and fatty cuts of meat. Cut down on added sugar and added salt. Even for people who are not trying to lose weight, it is recommended to have no more than about 6 teaspoons of sugar per day (and many processed foods contain sugar, corn syrup or the like).Eat 3 not-large-portioned meals per day; do not skip breakfast; and avoid sugary snacks. If you want a snack, try (for example) an apple or a handful of unsalted nuts. .Avoid crash-diets, fad diets, diet pills, etc. These may be harmful, and need not be considered by people who have adopted an otherwise healthy diet. Don't concentrate on specific foods so much as on a balanced, healthy diet plus exercise. Healthy nutrition means eating what your body needs, while ingesting as few harmful things as possible. It has also been described as getting enough of each of the major food categories, in healthy forms (grains, fruits, vegetables, protein, dairy, etc.; plus plenty of water).In general, an example of a healthy starting point could be a menu of whole-grain foods and bread, a good amount of vegetables, legumes, some fruits and nuts, fish, lean meats in not-large amounts, and some dairy. However, this may need adjusting according to one's lifestyle, age, health, weight and other factors at the outset; and also later, as one sees what works for him/her in particular.More guidelines:In addition to the diet described above, try to get plenty of moderate aerobic exercise (intense exercise may damage your joints). It isn't essential to join a gym; you can do sit-ups, pushups, dumbbell-lifting, jumping-jacks, and many other basic exercises at home. Walk as much as possible. Bicycling and swimming are good too. Even for people who are not trying to lose weight, being active helps your digestion, your circulation, and other body processes, and will help improve your mood. Also...whenever you feel queasy, nauseous, constipated or otherwise not completely well, try to remember what you've eaten over the last several hours or the last day. This is one factor in adjusting one's food habits.Disclaimer: Sensible diet plans such as the one above may be good for most people, but there are exceptions. Some people with complications such as glandular or other disorders, may find the above plan to be insufficient. If one keeps gaining weight despite eating healthily, professional advice may be needed.