Some specific foods that fall under this rule include: pancakes, waffles, bread, tortillas, biscuits, muffins, cupcakes, cookies, brownies, pizza crust, alternative flour pastas, cereal, or ice cream. No commercially-prepared chips (potato, tortilla, plantain, etc.) or French fries either. However, this list is not limited strictly to these items—there may be other foods that you find are not psychologically healthy for your Whole30. Use your best judgment with those foods that aren’t on this list, but that you suspect are not helping you change your habits or break those cravings. Our mantra: When in doubt, leave it out. It’s only 30 days.
Legumes are members of a large family of plants that have a seed or pod. This category includes all beans, peas, lentils, tofu and other soyfoods, and peanuts. Legumes are not allowed on paleo because of their high content of lectins and phytic acid. Similar to grains, this is a point of controversy in the scientific community. In fact, lots of research supports eating legumes as part of a healthy diet because they are low in fat and high in fiber, protein and iron.
The paleo diet is promoted as a way of improving health. There is some evidence that following this diet may lead to improvements in terms of body composition and metabolic effects compared with the typical Western diet or compared with diets recommended by national nutritional guidelines. There is no good evidence that the diet helps with weight loss, other than through the normal mechanisms of calorie restriction. Following the paleo diet can lead to nutritional deficiencies such as an inadequate calcium intake, and side effects can include weakness, diarrhea, and headaches.
A metaresearch group at Tilburg University in the Netherlands investigates scientists’ research methods and operations, scrutinizing questionable practices such as selective reporting of statistical tests and data massaging. The group instead advocates for practices such as preregistering studies and making experimental data immediately available for open external review and verification. Its members are optimistic that “the perverse incentives of careerist academia, to hoard data and sacrifice rigor for headline-generating findings, will ultimately be fixed.”