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Probiotic-Fortified Yogurt May Trim Belly Fat

Probiotic-Fortified Yogurt May Trim Belly Fat : Main Image
The probiotic yogurt groups had positive changes in body composition
Researchers have been finding links between specific friendly intestinal bacteria (probiotics) and metabolism, weight management, and fat distribution. Now a study published in the British Journal of Nutrition showed that being consistent with eating a probiotic-fortified yogurt may be more important to its effectiveness at reducing belly and body fat than how much probiotic it contains.

Boosting the probiotic in yogurt

The study included 210 Japanese people with large abdominal fat areas. They were divided into three groups and given either 200 grams (about 7 ounces) of high-probiotic yogurt, low-probiotic yogurt, or no-probiotic yogurt to eat every day for 12 weeks. The yogurts all contained equal amounts of two bacterial strains commonly used to ferment milk into yogurt. The high-probiotic yogurt provided an additional 2 billion CFU (colony forming units) of the test probiotic, Lactobacillus gasseri, per day, and the low-probiotic yogurt provided 0.2 billion CFU of L. gasseri per day.

L. gasseri is part of the family of lactic acid-producing bacteria that colonize the human intestines and are thought to provide a wide range of health benefits.

Shrinking body fat with probiotic-enriched yogurt

Examinations done every four weeks during the study and once four weeks after the end of the study showed that the two probiotic yogurt groups had positive changes in body composition:

  • abdominal fat area was reduced,
  • overall body fat was reduced,
  • BMI (body-mass index, a ratio of weight to height that is used to diagnose overweight and obesity) decreased,
  • waist circumference decreased, and
  • hip circumference decreased.

The changes seen in this study were similar in both probiotic groups and were greater than reductions seen in the no-probiotic group. However, four weeks after stopping the yogurt, the benefits diminished and the differences between the probiotic yogurt groups and the no-probiotic group were lost.

Consistency matters more than the amount

The changes seen in the probiotic yogurt groups were similar to those seen in a previous study performed by the same team of researchers in which participants ate a more concentrated probiotic-fortified yogurt that provided 20 billion CFU of L. gasseri per day, leading the study authors to speculate that lower amounts of this particular probiotic may be as effective as higher amounts when it comes to reducing body and belly fat. They added that, based on their findings, "constant consumption might be needed to maintain the effect."

The study authors also noted that L. gasseri appears to have a stronger effect than regular yogurt bacteria, which were present in all of the yogurts and in greater concentrations than the L. gasseri in the probiotic-fortified yogurts.

Maintaining your friendly gut bacteria

In addition to considering a probiotic supplement, here are several ways to promote the colonization and growth of healthy intestinal bacteria:

  • Eat prebiotic-rich foods. Prebiotics are fibers in food that are indigestible by humans but are readily digested by healthy gut bacteria. Fruit and vegetables generally provide good amounts of prebiotic fiber, but asparagus, garlic, onion, and Jerusalem artichoke (or sunchoke) are especially rich.
  • Limit animal protein and simple carbohydrates. Both can promote the growth of unhealthy intestinal micro-organisms.
  • Eat fermented foods. In addition to yogurt and other fermented milk foods, lactic acid-forming bacteria are found in unpasteurized sauerkraut, kimchi, and fermented vinegar-free pickles. Although the strains of lactic acid-forming bacteria found in these foods may not have the same effect on fat metabolism as was seen in this study, these bacteria have been found to prevent intestinal and vaginal infections, improve general digestive health, strengthen immune function, and may prevent certain cancers.

(Br J Nutr 2013; doi:10.1017/S0007114513001037)

Maureen Williams, ND, completed her doctorate in naturopathic medicine at Bastyr University in Seattle and has been in private practice since 1995. With an abiding commitment to access to care, she has worked in free clinics in the US and Canada, and in rural clinics in Guatemala and Honduras where she has studied traditional herbal medicine. She currently lives and practices in Victoria, BC, and lectures and writes extensively for both professional and community audiences on topics including family nutrition, menopause, anxiety and depression, heart disease, cancer, and easing stress. Dr. Williams is a regular contributor to Healthnotes Newswire.
 
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