Before the advent of agriculture, humans were hunter-gatherers. They foraged for edible fruit, nuts, stems, leaves, corms, and tubers, scavenged for dead animals and hunted living ones for food. Forest gardening in a tropical jungle clearing is thought to be the first example of agriculture; useful plant species were identified and encouraged to grow while undesirable species were removed. Plant breeding through the selection of strains with desirable traits such as large fruit and vigorous growth soon followed. While the first evidence for the domestication of grasses such as wheat and barley has been found in the Fertile Crescent in the Middle East, it is likely that various peoples around the world started growing crops in the period 10, 000 BC to 7, 000 BC. Subsistence agriculture continues to this day, with many rural farmers in Africa, Asia, South America, and elsewhere using their plots of land to produce enough food for their families, while any surplus produce is used for exchange for other goods. Throughout recorded history, the rich have been able to afford a varied diet including meat, vegetables and fruit, but for poor people, meat was a luxury and the food they ate was very dull, typically comprising mainly some staple product made from rice, rye, barley, wheat, millet or maize. The addition of vegetable matter provided some variety to the diet. The staple diet ofthe Aztecs inCentralAmericawasmaize andtheycultivated tomatoes, avocados, beans, peppers, pumpkins, squashes, peanuts, and amaranth seedsto supplement their tortillas and porridge. In Peru, the Incas subsisted on maize in the lowlands and potatoes at higher altitudes. They also used seeds from quinoa, supplementing their diet with peppers, tomatoes, and avocados. The Reasons to eat Vegetables Eating a diet rich in vegetables and fruits as part of an overall healthy diet may reduce risk for heart disease, including heart attack and stroke. Eating a diet rich in some vegetables and fruits as part of an overall healthy diet may protect against certain types of cancers. Diets rich in foods containing fiber, such as some vegetables and fruits, may reduce the risk of heart disease, obesity, and type 2 diabetes. Eating vegetables and fruits rich in potassium as part of an overall healthy diet may lower blood pressure and may also reduce the risk of developing kidney stones and help to decrease bone loss. Eating foods such as vegetables that are lower in calories per cup instead of some other higher-calorie food may be useful in helping to lower calorie intake. Vegetables are important sources of many nutrients, including potassium, dietary fiber, folate (folic acid), vitamin A, and vitamin C. Nutritional composition of Vegetables i.Okra provides vitamin C and the B vitamins, magnesium, lutein, and potassium. ii.Green beans are a good source of vitamin C, folic acid, iron, and potassium. iii.Carrots are rich in beta-carotene, vitamins A and K, and potassium. iv. Pumpkin is low in Saturated Fat, and very low in Cholesterol and Sodium. It is also a good source of Vitamin E (Alpha Tocopherol), Thiamin, Niacin, Vitamin B6, Folate, Iron, Magnesium and Phosphorus, and a very good source of Dietary Fiber, Vitamin A, Vitamin C, Riboflavin, Potassium, Copper and Manganese. v.Sweet potato is an excellent source of vitamins A, B6, and C, iron, fiber, and potassium. Plus, just 1 cup of sweet potato contains four times the recommended daily allowance of beta-carotene! Low in Fat: Most vegetables are naturally low in fat and calories. None have cholesterol. (Sauces or seasonings may add fat, calories, and/or cholesterol.) Potassium: Diets rich in potassium may help to maintain healthy blood pressure. Vegetable sources of potassium include sweet potatoes, white potatoes, white beans. Dietary fiber: Dietary fiber from vegetables, as part of an overall healthy diet, helps reduce blood cholesterol levels and may lower risk of heart disease. Fiber is important for proper bowel function. It helps reduce constipation and diverticulosis. Fiber-containing foods such as vegetables help provide a feeling of fullness with fewer calories. Folate (folic acid): Helps the body form red blood cells. Women of childbearing age who may become pregnant should consume adequate folate from foods, and in addition 400 mcg of synthetic folic acid from fortified foods or supplements. This reduces the risk of neural tube defects, spina bifida, and anencephaly during fetal development. Vitamin A: keeps eyes and skin healthy and helps to protect against infections. Vitamin C: helps heal cuts and wounds and keeps teeth and gums healthy. Vitamin C aids in iron absorption.