White Kidney Bean Extract for weight loss

white kidney beans

Low carb diets are everywhere these days, and for good reason – they WORK. But if you are trying to lose weight and overindulge in carbs, you may find losing weight more challenging and frustrating.

White kidney bean extract may help you out by helping to change how your body metabolizes the food you eat.

Blocks Carbs from being digested

White kidney bean extract is used as a natural, non-stimulant ingredient in nutritional and weight loss supplements. The key benefit of white kidney bean extract is that it delays digestion and absorption of carbohydrates by blocking an enzyme, alpha amylase, which enables digestion of carb in the small intestine.

Promotes satiety (feeling of fullness)

By slowing the digestion and absorption of carbohydrates, white kidney bean extract effectively lowers the glycemic index of “bad” (low fiber) carbs.


More details on carb digestion

Is White Kidney Bean Extract Good for Weight Loss?
When you eat starches, otherwise known as complex carbohydrates, the digestion actually starts in your mouth before the food ever gets to your stomach and then to the small intestine.

In fact, starch carbohydrates are mainly digested in the mouth and small intestines. Once the starch enters the stomach, the digestive enzyme used to break it down is destroyed by the high pH levels in the stomach.

As the food moves on to the small intestine, it starts undergoing more digestion. While the stomach neutralized alpha-amylase, the pancreas also secretes alpha-amylase, which it now sends to the small intestine to continue breaking down the starch to simple sugars.

Active ingredient blocks alpha-amylase secretion

The active ingredient in white kidney bean extract is something called “phaseolus vulgaris” which interferes with the pancreas’s ability to secret alpha-amylase. In other words, it’s blocking the enzyme necessary for starch digestion.

What the research shows us about white kidney bean extract and possible weight loss benefits…

A review of six clinical trials of white kidney bean extracts did find a statistically significant reduction in body fat (averaging about 4 pounds) when compared to placebo.

Study #1
In one study overweight individuals were given 3,000 mg of extract daily or placebo and ate a normal-calorie diet which was rich in carbohydrates. After 8 weeks those taking Phase 2 lost an average of 3.8 lbs. while those getting the placebo lost only an average of 1.65 lbs.; (Udani, Altern Med Rev 2004).

Study #2 In the second study, subjects participated in a weight loss program including diet, exercise, and behavioral modification and took either 2,000 mg of extract daily (1000 mg twice per day) or placebo for 4 weeks. Overall, the results were not significantly different between the two groups, however, among individuals with the highest intake of carbohydrates, those taking the extract had a significant reduction in weight and waist size compared to placebo (Udani, Altern Ther Med 2007).

Study #3
The third study involved a much lower dose of Phase 2 — 445 mg of extract once per day, and subjects ate a calorie-restricted diet. After 30 days, those taking Phase 2 had lost 6.6 pounds compared to 0.8 pounds among those taking placebo and experienced significantly greater reductions in fat mass and waist circumference (Celleno, Int J Med Sci 2007). It was noted that, in this study, the product was standardized to 3,000 alpha amylase inhibiting units (AAIU) per gram.

Study #4
A study, published in the Internal Journal of Medical Science, conducted a double-blind, placebo-controlled study, in which 60 slightly overweight people were given either placebo or Phase 2, a highly concentrated phaseolus extract, once daily.

This single daily dose was given 30 minutes prior to a large meal rich in carbohydrates.  Over the 30 days of the study, subjects receiving Phaseolus vulgaris extract had significantly greater reduction of body weight, BMI, fat mass, adipose tissue thickness, and waist/hip/ thigh circumferences while maintaining lean body mass compared to subjects receiving placebo.

research notes:

Layer, P., et al. “Effect of purified amylase inhibitor on carbohydrate tolerance in normal subjects and patients with diabetes mellitus.” MAYO Clinic Proceedings 61, 6 (June, 1986) 442-447.

Brugge, W.R. and M. S. Rosenfeld. “Impairment of starch absorption by a potent amylase inhibitor.” American Journal of Gastroenterology 82, 8 (August, 1987) 718-722.

Layer, P., et al. “Effects of decreasing intra luminal amylase on starch digestion and postprandial gastrointestinal function in humans.” On carbohydrate tolerance in normal subjects and patients with diabetes mellitus.” Gastroenterology 91, 1 (July, 1986) 41-48.


What Dr. Oz has to say about white kidney bean extract…

Recently, Dr. Oz recommend the product on his show. The video is here.

Clearly, Dr. Oz and his guest Lisa Lynn both feel this can be beneficial for weight loss.

Dr Oz’s show on fat busting metabolism boosters mentioned L-Carnitine, Raspberry Ketone, Konjac Root Fiber and an Unworkout Workout as ways to boost your metabolism.  But Doctor Oz saved White Kidney Bean Extract for its own segment because he said it was one of his favorite Fat Busters! 

His guest, Lisa Lynn, said that taking White Kidney Bean Extract is not the green light to eat anything that you want, but we live in a real world where people want to eat carbs and this supplement prevents carbs from being broken down into sugars in your body.

From Dr Oz website:

Metabolic-Boosting White Kidney Bean Extract – This ingredient is a known carb blocker and works great for those “off” eating days. Taken along with a high-carb, high-fat meal, white kidney bean extract will block those unwanted calories from being stored as fat. It will also keep your blood sugar balanced. Aim for 300-500 mg two times a day with meals.

It seems fair to say that there is strong evidence that shows white bean extract can block starch digestion and therefore can help reduce extra starches and their calories from being deposited as body fat.

But note there is no indication it has any effect whatsoever on “boosting metabolism” as some unscrupulous marketers claim. You just need to understand HOW it works.

Conclusion: If you overindulge in carbs, you might give it a try. But if you are on Atkins or some other Low Carb diet, it probably won’t help you much.

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