Although you have not given the height of your husband considering his 100kg weight i am feel he needs some weight reduction.Is he on diet control,exercise etc. If not what he can do is start the day with a glass of lukewarm water with a teaspoonful of honey or lime juice in it.Try to get up at 6am in the morning and go for a 20 min brisk walk daily.Use only skimmed milk.Vegetables and fruits (avoid banana and cheeku) are low calorie foods, therefore, eating more of them will help in weight loss.Try to use sunflower or safflower oil in diet.. Green tea/Mint Tea is one of the popular home remedies for weight loss.Eat two red tomatoes every morning in breakfast for a few months. This will help in restricting calorie intake.. Minimize your carbohydrate intake. Avoid rice and potatoes. Wheat, barley and maize are ideal substitutes for rice in people who has weight problems. Also do not consume oily and fatty substances like clarified butter, butter and sweet potato.For lunch you can have Salads of raw vegetables such as carrot, beet, cucumber, cabbage, tomatoes. Steamed or boiled vegetables.Whole grain bread or whole wheat chapatis (Indian bread) and a glass of buttermilk.Roasted cumin seeds, green coriander leaves, a little salt and some grated ginger mixed in the buttermilk.For dinner try using Whole grain bread or chapatis,Steamed vegetables,Seasonal fruits except banana and apple.Milk products like cheese, butter etc. and non-vegetarian foods should be avoided as they are rich in fat.Spices like dry ginger, cinnamon, black pepper etc. are good for loosing weight and can be used in a number of ways. Raw or cooked cabbage inhibits the conversion of sugar and other carbohydrates into fat. Hence, it is of great value in weight reduction