Overweight is generally defined as having more body fat In histology, adipose tissue or body fat or just fat is loose connective tissue composed of adipocytes. Adipose tissue is derived from lipoblasts. Its main role is to store energy in the form of fat, although it also cushions and insulates the body. Obesity or being overweight in humans and most animals does not depend on body weight but on the than is optimally healthy At the time of the creation of the World Health Organization , in 1948, health was defined as being "a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity". Being overweight is a common condition, especially where food supplies The dietary energy supply is the food available for human consumption, usually expressed in kilocalories per person per day. It gives an overestimate of the total amount of food consumed as it reflects both food consumed and food wasted. It varies markedly between different regions and countries of the world. It has also changed significantly over are plentiful and lifestyles are sedentary Sedentary lifestyle is a medical term used to denote a type of lifestyle with a lack of physical exercise. It is commonly found in both the developed and developing world and characterized by sitting, reading, watching television and computer use for much of the day with little or no vigorous physical exercise. It is known to contribute to obesity[. As much as 64% of the United States The United States of America is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the adult population is considered either overweight or obese Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy and/or increased health problems. Body mass index , a measurement which compares weight and height, defines people as overweight (pre-obese) when their BMI is between 25 kg/m2 and 30, and this percentage has increased over the last four decades.[1]
Excess weight has reached epidemic proportions globally, with more than 1 billion adults being either overweight or obese.[2] Increases have been observed across all age groups.
A healthy body requires a minimum amount of fat Fats consist of a wide group of compounds that are generally soluble in organic solvents and largely insoluble in water. Chemically, fats are generally triesters of glycerol and fatty acids. Fats may be either solid or liquid at normal room temperature, depending on their structure and composition. Although the words "oils", "fats& for the proper functioning of the hormonal A hormone is a chemical released by one or more cells that affects cells in other parts of the organism. Only a small amount of hormone is required to alter cell metabolism. It is essentially a chemical messenger that transports a signal from one cell to another. All multicellular organisms produce hormones; plant hormones are also called, reproductive The reproductive system is a system of organs within an organism which work together for the purpose of reproduction. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system. Unlike most organ systems, the sexes of differentiated species often have significant differences. These, and immune An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and killing pathogens and tumour cells. It detects a wide variety of agents, from viruses to parasitic worms, and needs to distinguish them from the organism's own healthy cells and tissues in order to function systems, as thermal insulation The term thermal insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. Heat energy can be transferred by conduction, convection, radiation or by actual movement of material from one location to another. For the purposes of this discussion only the first three, as shock absorption A shock absorber in common parlance is a mechanical device designed to smooth out or damp shock impulse, and dissipate kinetic energy for sensitive areas, and as energy Lipids are a broad group of naturally-occurring molecules which includes fats, waxes, sterols, fat-soluble vitamins , monoglycerides, diglycerides, phospholipids, and others. The main biological functions of lipids include energy storage, as structural components of cell membranes, and as important signaling molecules for future use. But the accumulation of too much storage fat can impair movement and flexibility, and can alter the appearance of the body Human body shape is a complex phenomenon with sophisticated detail and function. The general shape or figure of a person is defined mainly by skeletal structure, muscles and fat. Skeletal structure grows and changes only up to the point at which a human reaches adulthood and remains essentially the same for rest of his or her life.
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