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本帖最后由 yearshappy 于 16-3-2019 22:57 编辑
Lichtenstein, Dietary Fat: A History, Nutrition Reviews, vol.57, no.1, 1999.
Intro:
- meat (fat) was socially/culturaly presitigious food in the past; it's now associated with ill health.
Early diets
- Paleolithic Period (preagricultural humans): the typical diet of the Paleolithic period estimatedly consisted of 50% plant-based foods and 50% foods of animal origin.
- The agricultural and industrial revolution: (the collective human genome has changed little since the period when Homo sapiens began to flourish, but the food supply has changed dramatically) During this period with the development of modern food-processing techniques became widely available in place of whole grains and begetables. With all the changes in food supply there was also a shift back toward the sonsumption of animal protein.
The changing food supply- meat: the wild animals were once forced to hunt for food and at times had to cover great distances to ensure their survival. Consequently, they had relatively low body fat. Modern breeding practices have focused on keeping animals relatively inactive to encourage weight gain.
- vegetables and fruits: the modern diet is less constrained by geographic and seasonal abailability, owing to continued improvements in the cultivation and transportation of vegetalbes.
- plant-based fats and oils: modern processing of plant-based oils often includes hydrogenation (saturation/trans fatty acids) which (trans fat)can be used to raise its chemical stability to enhance storage properties / increading the risk of developing cardiovascular disease
- dairy products: continue to be major contributiors of saturated fat to the diet (retentiong of intestinal lactase/milk throughout adulthood)
- cereal products: the major plant-based foods for Paleolithic ancestors were fruits, buds, leaves, and roots; for current day, they are replaced by cereal products. Cereal grains tend to have more fat.
Historical notes on fat metabolism
- 1833, 1849, 1897, gradually recognition of food fat/carbs contributing to body fat
Fat-soluble vitamins
History of regulations on fat
- During the first half of the 20th century (1975,1990), regulations on saturated fat
Recent recommendations for fat intake
- useage of fat was recorded by Old Testament, the Romans, Persians
- the primary nutrition concerns of modern humans is excessive saturated fat intake
- fat intake to less than 30% of calories while saturated fat intake to less than 10% of calories
Ben-Dor, Miki, Use of Animal Fat as a Symbol of Health in Traditional societies Suggests Humans may be Well Adapted to its Consumption, Journal of Evolution and Health, 2015.
- could be a sample of abstrat: background (how it comes/why ..) and objectives (aims to provide a ... view to the debate ..); methodology (literature review of importantce of ..); results (collection of 200 cases from ...); conclusion (in line with evidence for the .. )
- keywords: fat, animal fat, saturated fat, symbol, evolution, health
- intro, methodology, results, discussion, and conclusion & implications.
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