start." Plus, you'll be able to identify potential allergies to grains and dairy, after you introduce them back into your diet. Once your body has had a chance to reset, you'll be able to easily see if any of these things make you feel tired, bloated, or foggy.
The Downsides to the Whole 30
You mean, besides being cranky? If you take a high-protein, low-carb approach (you don't need to though: potatoes are technically allowed, but grains—even whole ones—are not), your body can enter a ketotic state. When you don't have enough carbs to burn for energy, the body breaks down fat to use, which releases ketones. When it has to break down too much fat, ketone levels can get too high and the kidneys can malfunction.
If you're doing the Whole 30 for a medical reason, talk to your doc first. If you're just looking for a structured way to clean up your diet and cut processed foods, the extreme nature of the plan could take a toll. Example: If you break just one rule, you'll need to start all over—yes, even on day 29. "People often feel like they've lost all they've worked so hard for, leading to self-loathing and giving up entiirely," says certified nutritionist
. "Eating healthy, whole foods does not need to be this extreme." That said, if you respond to structure and are an otherwise healthy person, go for it (and keep the above note on carbs in mind). Here, some additional tips from Hartwig to get you through the month: