You wake up feeling full, puffy, and distended wondering what you ate last night for dinner. You’ve done elimination diets, but you still don’t understand what you should be eating to feel well. If you want to fit into your skinny jeans or that tight-fitting dress by tomorrow, you’ve got to start by feeding your gut flora the right types of food. Why? New science is showing the major role your gut bacteria play in how you feel around the waist, and you can actually alter your gut bacteria in as little as one day by the way you eat. For a long-lasting change, follow this plan for 28 days from Vincent Pedre, MD, internist, certified functional medicine practitioner, and author of Happy Gut: The Cleansing Program to Help You Lose Weight, Gain Energy, and Eliminate Pain.