How Does BioFit Really Work? The Connection Between Probiotics And Weight Loss According to the company behind the BioFit probiotic supplement, this product is different as it includes several live probiotic strains to help trigger weight loss. At this point, you might have different questions in mind, such as what probiotics really are and how can they help with fat loss. If you haven’t heard about probiotics by now, these little live strains have been making headlines for years now. Probiotics refer to live bacteria that are actually beneficial for the body. Unlike the usual bacteria that bring about different diseases inside the body, these strains help improve gut health.