Bacteria can influence weight

Yet another study has linked the profile of bacteria found in your colon (called the microbiome) to obesity and weight gain. This paper, published in Nature Reviews Endocrinology (7:639-646), reviewed the latest studies to investigate the contribution of bacteria to nutrient metabolism and obesity. Their review has demonstrated that numerous studies have begun to understand the influence of the profile of bacteria in the control of overall weight. Together, all of these studies suggest that the microbiome may be a critical player in metabolism and can influence weight gain or loss.

A new protein that controls obesity

Obesity is on the rise. Our diets aren’t healthy (or low in calories) and we are increasingly sedentary. Many scientists are researching how to control obesity and how to prevent obesity-related diseases including diabetes, cardiovascular disease and cancers. A new study by Zhang et al (Journal of Biological Chemistry 286:28396 August 12, 2011) identifies another player in the regulation of body mass and obesity. This protein, beta-arrestin 1, appears to regulate the expression of genes involved in metabolism and in inflammation. Since both are linked to many obesity-related diseases, these investigators investigated its role in obesity. Elimination of the gene increases body mass and metabolic dysregulation in mice fed a high fat diet. Conversely, overexpression of beta-arrestin 1 reversed these effects and restored normal weight, even in the presence of excess calories. While this is far from a magic pill to control weight and obesity, it does provide insight into how the body regulates weight and its metabolism.