The science of human nutrition is mainly concerned with defining the nutritional requirements for the promotion, protection and maintenance of health in all groups of the population.Such knowledge is necessary in order to assess the nutritional adequacy of diets for growth of infants, children and adolescents, and for maintenance of health in adults of both sexes and during pregnancy and lactation in women.
Fats and oils include butter, lard, suet, and vegetable oils.
They are all high in calories, but, apart from butter and such vegetable oils as red palm oil, they contain few nutrients.
The National Health and Nutrition examination survey indicated that the United States population has decreased its intake of fat but increased its intake of sugary and energy giving foods, while the incidence of obesity has increased (US Department of Health and Human Services, 2006) and throughout the world.
The implication here is that there is a greater likelihood of developing obesity with the consumption of sugar than with the consumption of fat.
The word nutrient or food factor is used for specific dietary constituents such as proteins, vitamins and minerals.
Dietetics is the practical application of the principles of nutrition; it includes the planning of meals for the healthy as well as the sick.
In the same area of research, nutrition experts are trying to unravel the relationship between diabetes and obesity and the role that sweets play for people with these conditions.
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In the United States and such other countries, increasing use of sugar in foods has led to an increase in obesity levels.