Although in recent years public health and medical authorities have highlighted many of the “bad” health effects of dietary fats, some fat intake is really essential to normal physiological function.
For instance , fat may be a critical component of cell membranes and is important for steroid synthesis. Consuming some dietary fat is additionally important for adequate absorption of fat-soluble vitamins (vitamins A, E, D, K, and carotenoids) from food. Furthermore, certain n–3 and n–6 polyunsaturated fatty acids are designated as essential fatty acids, meaning the body cannot synthesize them de novo and that they must be consumed within the diet.
Therefore, if dietary fat intake is just too severely limited, it may result in physiological dysfunction and clinical pathology. especially , very low fat diets aren’t recommended for young children, WHO require higher levels of fat than do adults as a concentrated source of calories for growth.
- Although some dietary fat is important for health, in developed countries the most important problem is just too much dietary fat instead of insufficient . Although it’s commonly acknowledged that Americans have reduced their percentage of calories from fat over the last three decades, what’s often unrecognized is that the incontrovertible fact that actual fat consumption (ex. grams of fat intake per day) has remained quite high since the 1960s.
- The reduction in fat percentage is thanks to the very fact that total calorie intake has increased instead of that fat intake has decreased. Actually, compatible with the USDA, consumption of added fats from processed foods and cooking oils increased by 63% from 1970 to 2005, reaching ∼86 pounds per person (vs. 33 pounds per person in 1970).
The current dietary guidelines for Americans recommend consumption of 20–35% of calories from fat, with but 10% of calories from saturated fat (1). the rules continue to means , however, that individuals who consume fat at the upper end of this range may have difficulty limiting saturated fat and avoiding excess calorie intake.
The latter is a problem partially because fat is that the most energy-dense macronutrient: 9 kcal/g, compared with 4 kcal/g for carbohydrate and protein. Excess dietary fat consumption may be a concern because considerable research suggests that an excessive amount of dietary fat can cause obesity, inflammation, and increased chronic disease risk as discussed below.
In addition to limiting total dietary fat intake to a healthy range, attention to the sort of fat consumed is additionally vital . Dietary lipids include triglycerides, sterols, and phospholipids.
Triglycerides are the foremost abundant sort of dietary lipid and, as such, much of the stress regarding dietary fat and health relates to the triglyceride carboxylic acid composition (i.e., whether the carboxylic acid is saturated, monounsaturated, or polyunsaturated). Although sterols and phospholipids comprise a little proportion of total dietary lipids, a number of these compounds (e.g., cholesterol) also are quite important
• a particular amount of dietary fat, particularly the essential n–3 and n–6 fatty acids, is necessary for normal physiological function.
• the main sorts of dietary fats are saturated fats (largely from animal products) and mono- and polyunsaturated fats (found in vegetable and a few animal sources).
• Fat is that the most calorically dense macronutrient (9 kcal/g)
• High-fat diets are shown to contribute to excess energy intake and obesity.
• Both total dietary fat and various sorts of fatty acids are related to cardiovascular and metabolic risk factors. generally, saturated fats and trans fats have an adverse effect and risk factors on health, while n–3 polyunsaturated fatty acids have beneficial effects on multiple risk factors.