According to gut health expert Megan Rossi, Ph.D., R.D. (aka The Gut Health Doctor on Instagram), author of How To Eat More Plants, we’re thinking about weight loss all wrong. ‘When we’re fixating on calories, we completely forget about the gut microbiome and how important that is for regulating metabolism,’ she shares on this episode of the mindbodygreen podcast. Your gut is at the forefront of basically every bodily function—including your metabolism and appetite. That said, prioritizing gut health is step No.