Healthy eating is the act of following a balanced nutritional diet. Because our ideas of what counts as "healthy" change, according to scientific advances in the field of nutrition, along with personal and cultural considerations, accepted standards of healthy eating differ from person to person, and throughout history.
Many governments and other organisations provide nutritional advice and launch schemes in order to promote health food. Diets which lead to obesity (being severely overweight), diabetes, and other medical conditions, are a severe drain of resources for national health providers, and on businesses due to reduced productivity of staff.
A recent health food campaign by the British government has attempted to impress the need to eat lots of fruit and vegetables using the slogan "5 a day". Adverts have given examples of what a portion of fruit or vegetables amounts to, and how 5 or more portions can be incorporated into one's diet.
Governments also put pressure on businesses to promote healthy food options, and regularly consider measures, such as banning the advertising of fast food, or taxing foods which are high in fat.
There is also near-unanimious agreement that hydrogenenated (aka trans fats) are not a particularly healthy form of calories, and that consuming some types of fish and seafood (a source of omega-3 fatty acids) before meat and poultry may contribute to an individual's health and longevity. Unfortunately, consumption of predatory fish at the top of the food chain (such as swordfish, mackerel, shark, and albacore tuna) increases ones exposure to mercury and PCBs, so the hazards may outweigh the health benefits as most fish contains trace amounts of pollution.
Eggs have long been a source of controversy -- suffice to say that egg yolks are richer in cholesterol than egg whites, and should be consumed in moderation, whereas egg whites contain little or no substances suspected of causing obesity or heart disease.
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