Losing weight is not the only way to fight obesity. Preventing unwanted weight gain in the first place may be even more valuable in avoiding obesity.

In one 4-week study, taking a probiotic formulation called VSL#3 reduced weight gain and fat gain in people following a diet that provided 1,000 extra calories than they needed per day 

Those in the probiotic group gained less fat, although they didn’t experience any significant changes in insulin sensitivity or metabolism.

This indicates that some probiotic strains might prevent weight gain in the context of a high calorie diet. However, this needs to be studied further.

SUMMARY

Certain probiotic strains may be able to reduce weight gain in people following a high calorie diet.