Recent evidence review affirmed peppers’ weight and metabolic potential 04/04/2012
from bell peppers?
Two years ago, researchers at Ontario's McMaster University reported that purified capsinoids from sweet peppers increased calorie burning substantially in people engaged in aerobic exercise (Josse AR et al. 2010).
Scientists from McMaster's Exercise Metabolism Research Group recruited 12 healthy young men (average age 24) with average BMIs for crossover, double-blind trial.
The men were randomly assigned to receive either a placebo or purified capsinoids.
Their metabolic and thermogenesis rates were measured while they were at rest and after 90 minutes of moderately intense aerobic exercise (stationary cycling).
As the Canadians wrote, "… compared to the placebo pills, [supplemental] capsinoids increased resting energy expenditure by about 20 percent, and … capsinoid ingestion induced greater lipid oxidation [fat-burning] at rest” (Josse AR et al. 2010).
Neither of these effects was seen during the exercise period, but the McMaster team found that the men drew more heavily than usual on stored body fat (versus stored sugars) as fuel after 30 minutes of exercise.
As they put it, "The changes we observed confirm previous data on the thermogenic and metabolic effects of capsinoids at rest and further promote its potential role as an adjunct weight loss aid, in addition to diet and exercise” (Josse AR et al. 2010).
Stimulate thermogenesis (raises the metabolic rate, thus increasing the body's propensity to burn stored body fat and sugars).
Inhibit post-meal rises in blood sugar, thereby moderating release of insulin and curbing craving for starchy/sugary carbs.
Josse AR, Sherriffs SS, Holwerda AM, Andrews R, Staples AW, Phillips SM. Effects of capsinoid ingestion on energy expenditure and lipid oxidation at rest and during exercise. Nutr Metab (Lond). 2010 Aug 3;7:65.
Ludy MJ, Moore GE, Mattes RD. The effects of capsaicin and capsiate on energy balance: critical review and meta-analyses of studies in humans. Chem Senses. 2012 Feb;37(2):103-21. Epub 2011 Oct 29.