The Dietary Guidelines for China Residents points out that people over 6 years old should consume 30-50g of bean products and nuts. Nuts are rich in polyunsaturated fatty acids, which are also essential fatty acids for human body.
It is called essential fatty acid because it cannot be synthesized in the body and must be taken from food to meet the needs of the body. Essential fatty acids include n-6 series. Among them, n-6 series linoleic acid essential fatty acids can synthesize arachidonic acid in vivo, and n-3 series essential fatty acid α -linolenic acid can synthesize EPA and DHA in vivo.
Extended data:
There are three main DHA supplements on the market:
The first category is fish DHA products. Some fish oil supplements (including DHA supplements) contain harmful substances such as PCB (polychlorinated biphenyls) and dioxins, as well as heavy metals such as mercury and lead. Most fish oil products on the market are soft gels or emulsions.
The second category is algae DHA products. The algae oil DHA extracted from marine microalgae by patented technology does not go through the food chain, does not involve marine pollution and does not contain heavy metals. Pure plant DHA is easier to absorb, which is very suitable for pregnant mothers, nursing mothers and infants.
The third category is egg yolk DHA, which belongs to lecithin-type DHA. Lecithin-type DHA is decomposed into lecithin and DHA in human body, and they are supplemented together. DHA in egg yolk is biological DHA, which has not been chemically treated, so there is no chemical residue and no heavy metal pollution, and it is the safest DHA.
It is also rich in lecithin and other nutrients, all of which are not externally added or chemically produced, but are enriched from chicken. It has natural characteristics and high absorption efficiency, and is more valuable for infants with immature liver and gallbladder and high safety requirements.
References:
Baidu encyclopedia -DHA