You should eat fatty or sugary foods in small amounts or not very often. Some foods have obvious 'visible' fat or sugar. Visible fats include butter, margarine, low fat spreads, cooking oils, mayonnaise and oily salad dressings.
Meat has visible fat too.
Visible sugar includes table sugar and honey. Hidden fats and sugars are found, for example, in meat products such as sausages, meat pies, burgers and pizzas, and in biscuits, cakes, puddings, ice-cream, chocolate, sweets, crisps and sweetened drinks. Grill, bake, casserole, microwave or steam instead of frying. Choose a low or reduced fat spread rather than butter, hard margarine or ordinary soft margarine - one that is labelled 'high in polyunsaturates'. If you want to carry on using butter, try spreading it more thinly.