Diets are something that has always been around, from Atkins to South Beach and everything in between. But in recent years, there has been even more new diets to come about.

Today, you can’t scroll through your newsfeed without finding an article about some of the most trending diets, such as paleo, whole 30, and keto. There’s so many to keep track of, so how do you know which one is the best one for you, if any?

Let’s go through some of them so we can break it down for you so you can clearly see what you can and can’t eat.

The paleo diet, also known as the caveman diet, only allows you to eat foods that the first humans ate millions of years ago. That means you must avoid foods such as grains, most dairy, sugar, beans, and peanut butter, and only eat foods such as fruits, veggies, lean proteins, and healthy fats.

The Whole 30 diet is an elimination diet that you do for 30 days straight. You eliminate some of the most troublesome foods for people—ones that commonly cause cravings, blood sugar spikes, and inflammation. These include sugar (real or artificial), alcohol, grains, legumes, dairy, baked goods, and anything with carrageenan, MSG or sulfites.

After the 30 days, you reincorporate some of the foods slowly, with the point of finding out if you have any food intolerances. Most people also lose weight in the process and adapt healthy eating practices for life.

Both diets do have their pros and cons, but for the most part, they have a pretty good reputation. They encourage you to eat as naturally as possible, and focus on wholesome, real ingredients.

The keto diet sort of does that as well, but it has some major flaws, ones that a lot of people have trouble getting behind. The main component behind the keto diet is that it cuts carbohydrates completely out of your diet.

Sure, that means you don’t eat things like white pasta, white bread and baked goods, which aer bad for you, but that also means you can’t eat whole grains, fruits and veggies—which are actually really healthy for you.

The claim the keto diet makes is that it kick starts your body into a state of ketosis, where your body exclusively burns fat. Sounds great right?

Not necessarily. Since it eliminates all carbs, even the healthy ones, you risk taking in high amounts of saturated fat too. And it’s just never a good idea to eliminate an entire macronutrient altogether. Fitness celebrity Jillian Michaels has a lot to say about that.

“I don’t understand. Like, why would anyone think this is a good idea?” Michaels, 44, said. “‘You know what we need to do? All fat and animal protein!’ No! Bad plan. For a million reasons.”

To hear why Michaels thinks the keto diet is the worst fad diet to ever exist, check out her rant in the video below.

Have you ever followed the keto diet? What about any of the other fad diets? Have you noticed lasting results?