Diabetes increases the risk for heart disease, so its important to control diabetes as well to reduce the risk. He must continue brisk walking as it will not only lower his cholesterol levels but also control blood sugar levels. As far as diet is concerned, he needs to eat a low fat and high fibre diet. Such a diet will lower cholesterol and help in managing diabetes too. Ask him to cut down on his intake of fats especially saturated fats and cholesterol. If he is a non-vegetarian, he can opt for lean cuts of meat, skinless chicken, fish and eggwhites. He must avoid fatty meats, organ meats, egg yolk as they are rich in saturated fats and cholesterol. Butter, clarified butter, margarine and cream must be avoided. He can have low fat dairy products like skimmed/toned or double toned milk and curd and cheese prepared from it. Inclusion of defatted soya products like soyamilk, tofu (soya paneer), defatted soya flour and soyabean chunks and granules will be beneficial as it is a good source of protein among vegetarian sources and helps in lowering cholesterol also. Select whole grain cereals like broken wheat porridges, oats, oat bran, wheat bran containing foods, whole wheat flour, whole wheat bread, brown rice/partly milled rice or parboiled rice. Avoid refined and starchy foods like white polished rice, white flour or maida based foods like bakery items ,cookies and biscuits, fried snacks and savouries. Choose refined vegetable oil for cooking like rice bran oil, canola oil, olive oil etc. Avoid vanaspati ghee or partially hydrogenated fats (trans fats) mainly found in processed foods. Include whole fruits like apples, guava, plums, oranges, melons and vegetables in the raw form as salads, as a part of regular diet. Avoid rich gravies and oily curries. Do not use more than 3-4 tsp of oil for cooking per person in a day. Hope this answers your query satisfactorily.