At the time Umbach was in Afghanistan, about a decade since US-backed forces captured Mazar-e-Sharif, most people's lives had regained some sense of normalcy. Men were back to their jobs as farmers or factory workers, and girls could go to school.
Dietary fats and oils. Dietary fats and oils are the most concentrated form of energy as they yield 9 calories/g, whereas, carbohydrates and proteins yield only 4 calories/gm. Nuts and oil seeds are good sources of fat. Beside rich in energy, dietary fats are incredible sources of essential fatty acids, vitamin E in addition to act as the transport vehicle for fat-soluble vitamins/hormones. There are two types of dietary fats, visible and non-visible fat.
Fats and oils both comes under the class of molecules called lipids (non-polar biological molecule insoluble in water). Fats and oils are simple lipids that is both are formed by esters of fatty acids with glycerol (a glycerol molecule linked by ester bonds to 3 fatty acids). Both are same chemically. The major differences are: 1) fats are solid at room temperature where oils are liquid at room temperature 2) fats are more saturated (more number of single bonds between its carbon atoms) compared to oils 3) fats are generally an animal product where as oils are often a plant derived product.