Diets high in complex carbohydrates have been shown to fight cancer and heart disease. Simple carbohydrates are good for energy, but provide empty calories, i.e., calories that supply no vitamins and minerals and should therefore be minimized. The food label doesn't specify a daily percentage or guideline for protein consumption because so much depends on individual needs. An athlete needs more than an office worker, but in a typical 2,000-calorie diet, it is recommended to consume about 50g of high quality protein daily. The FDA requires only vitamins A and C, iron and calcium on the label because the FDA feels these four vitamins and minerals are important in order to maintain a healthy diet and because they are most often deficient in the American diet.
Food companies can voluntarily list others.
Your goal is to get 100 percent of your Daily Value each day. The footnote is the same on every label. The daily values footnote is a reference chart that shows some Daily Values , it gives you basic guidelines on how much of each nutritional item you should eat daily. Depending on your calorie needs, you may need less or more. Follow these amounts and you're doing pretty well nutritionally.