White kidney bean is a kind of kidney bean, also known as common bean, which is native to South America. White kidney bean is rich in protein (22-27% of seed weight) and carbohydrates (39-47% of seed weight), and has high content of bioactive compounds, such as peptides, including α -amylase inhibitor (kidney bean protein), polyphenols, oligosaccharides and lectins.
It is said that white kidney beans can lose weight mainly because α -amylase inhibitors (kidney bean protein and kidney bean element) can reduce the activity of amylase in the body and reduce the ability of some amylases to digest carbohydrates, thus playing a role in losing weight.
As a natural bioactive substance, α -amylase inhibitor exists in the endosperm of many plant seeds. However, compared with other beans, the content of a- amylase inhibitor in white kidney bean is higher, so white kidney bean is often used to extract a- amylase inhibitor, which is called "white kidney bean extract".
Are α -amylase inhibitors really useful?
There is no problem in theory: the human body is forbidden to break down starch into sugar, which reduces energy conversion and forces the body to break down fat to supply energy.
Let's look at the experimental data.
1 in an experiment, compared with the control group, overweight individuals took 3000mg of white kidney bean extract every day and ate a diet rich in carbohydrates but with normal calories. After 8 weeks, the experimenters who used the white kidney bean extract lost an average of 3.8 pounds, while the control group only lost 1.65 pounds. Although there are differences, the differences are not significant.
Related information blocks carbohydrate absorption and weight loss: a clinical trial using phase 2 brand-derived broken white bean extract.
In another sample, the subjects participated in a four-week weight loss process, including dieting, exercise, behavior modification and so on. And take 2000 mg of white kidney bean extract every day (65438+twice a day, 1 time 1000mg). The results showed that although there was no significant difference compared with the control group. However, for the individuals with the highest intake of high carbohydrate, the experimenters who took the white kidney bean extract obviously lost weight and waist circumference.
Information about preventing carbohydrate absorption and weight loss: a clinical trial using patented broken white bean extract.
Remarks: In all the above experiments, the intake of amylase inhibitor in white kidney bean extract was ≥1g.
From these research data, for obese people who eat high carbohydrate diet, the extract of white kidney beans can really lose weight and waist circumference.
But all the effects are based on dose, and the standard of dose is based on the conclusion of scientific clinical experiments.
The FDA and Health Canada strictly stipulate that:
When the white kidney bean extract is used for weight management, the dosage before meals is 1g( 1000mg), and the active unit of each gram of amylase inhibitor should be 3000 u/g. ..
Source: 2005; Westerterp- Plantenga et al., 2005; Chantre and Lelong, 2002.
That is to say, the intake is less, and it basically has no effect.
It is impossible for us ordinary people to eat enough α -amylase inhibitors when we eat white kidney beans.
Secondly, the effective component of white kidney bean extract is α -amylase inhibitor protein, which is a glycoprotein, that is to say, long-term high temperature will make it lose its activity, and our general diet and cooking will completely destroy the activity of α -amylase inhibitor.
There is also a white kidney bean extract that only blocks starch! In other words, white kidney bean extract, the staple food you eat, such as rice, noodles, steamed bread and potatoes, can help you block about 66% of energy intake, but it has no effect on protein, fat and sugar intake.
Finally, to sum up: eating white kidney beans can't lose weight, but the extract of white kidney beans can effectively lose weight and waist circumference for obese people with high carbohydrate diet. Of course, users should pay more attention to the content of active ingredients and avoid blind use.