Because a lot is lost in every transition. It takes a lot of water and vegetable mass for a cow to grow one kilo of meat, then it takes several kilos of cow to grow one kilo of human. We'd use a lot less resources if we would eat more of the greens directly instead.
Nutrition Australia has developed a site about the Healthy Eating Pyramid. See link below.
Energy can be created by eating the right choice of foods, not eating too much, and not eating too little.
If eating Italian foods according to the food pyramid, your diet would consist largely of pasta and bread. Olive oil, fish, and cured meats would be at the top of the pyramid.
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dolphins get energy by eating different foods like squid fish and other animals
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The Food Pyramid is designed to make healthy eating easier. Healthy eating is about getting the correct amount of nutrients – protein, fat, carbohydrates, vitamins and minerals you need to maintain good health. Foods that contain the same type of nutrients are grouped together on each of the shelves of the Food Pyramid. This gives you a choice of different foods from which to choose a healthy diet. Following the Food Pyramid as a guide will help you get the right balance of nutritious foods within your calorie range.
When you eat healthier foods the energy is slowly released unlike sugar which gives you sudden bursts of energy and the healthier foods also help you concentrate.
Eating such foods as citrus fruits, nuts, spinach, cheese. These foods and many more will help, above all mostly foods you might not enjoy eating, vegetables and fruits although will help.
The Traffic Light Eating Plan follows the Food Guide Pyramid. Each food group can be split into groups based on the colors of the Traffic Light. There are GREEN foods, YELLOW foods, and RED foods.
The best way to increase energy in the body is by eating foods rich in carbohydrates and some sugar. Energy can also be increased by drinking a lot of fluids like water or fresh fruit juice.