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own without chemicals which can be harmful to human beings and the environment . Because we have so much to choose from, many panies and stores offer advice about what we should eat .Books, magazines, and television shows tell us about foods and pills we should buy to bee smarter, healthier , and more beautiful. It is probably better , however, if we spend our time and money on buying good food and keeping a balanced diet. If our diet includes foods from all the food groups , in the right amounts , we do not have to buy any supplements .The same goes for “crash diets” that some panies say will make us lose weight fast .Instead of eating expensive diet foods or going on unhealthy diets , we can simply try to eat less fat and sugar and exercise more . The best way to make sure that we will feel and look fine is to develop healthy eating habits .We ought to learn more about our body and the fuel it needs so that we can make sure that we are well prepared for the challenges and opportunities in life . Nutrients Function Sources protein eggs,milk and other dairy products. Main fuel for our body Vitamins, fibre and minerals Discussion What do the words fuel and green mean in the text?