We know that dietary habits strongly influence the number and composition of intestinal microorganisms and, also, the proper function of the intestinal flora.
We are also aware of the link between flora and body weight
and several studies have shown that people with obesity tend to have a different intestinal bacteria composition
which also varies with weight loss or gain.
Obesity has been associated with increases in the relative abundance of a certain group of bacteria genera called Firmicutes and proportional reductions in the abundance of another group, known as Bacteroidetes.
Tackling overweight and obese conditions requires a change in lifestyle, increasing caloric expenditure through physical exercise and reducing energy intake by adopting a low calorie diet. This change is in itself capable of transforming the intestinal flora.