If you're unfamiliar with Whole30, well, it basically puts you on a cleanse for a month, with no cheat days, and eliminates sugar, alcohol, grains, legumes, processed foods, cheating substitutes (think vegan cookies), and basically anything you enjoy. Paleo, meanwhile, has many similar guidelines, eschewing dairy and carbohydrates of all sorts and focusing meats and vegetables. It's also the diet of choice for Crossfitters, the workout fiends who love talking about how they eat nothing but steak and greens while they show you blisters they developed while doing 70 kip-ups in a row.
Now, nothing wrong with being on a diet and being in shape. Let's take a joke, people. But per the criteria, these diets proved ineffective and difficult for many people. On the opposite end of the spectrum, the DASH diet ranked no. 1, the MIND diet ranked no. 2, and the TLC diet ranked no. 3. Note to aspiring diet-book authors: