If you're still convinced that Whole30 is a good idea, because the food you're eating is causing uncomfortable symptoms, talk to a doctor who can rule out any underlying conditions first. Then, if they agree it could be related to your diet, see a registered dietitian who can safely figure out what is going on. Or, if you're just trying eat healthier, start small, Bailey says. "If there's a particular food or food group that you have trouble with, try limiting that in your overall diet," she says. "Being overly restrictive can backfire, therefore small steps over time is the best way to make changes to your food intake." (This is also a great way to get that accomplished feeling that many Whole30-ers report, without entering extreme territory.)