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Jillian Michaels talks fad diets, and reveals the one you should never, ever do

A lot of you are probably getting really worried summer or bikini season is right around the corner and your abs are still a long way away from where you'd ideally like them to be. It's no one's fault really, they shouldn't make pizza and cake so delicious.

If you haven't given up hope and are still looking to slim down before bikini season officially starts, Jillian Michaels says choosing a fad diet, like keto, isn’t the right choice. The personal trainer and Just Jillian star explained her thoughts on the low-carb, moderate protein and high-fat diet while guest starring on People TV.

“Don’t do keto,” she says. “How much time do I have? And I’m not allowed to swear? Yes, keto is a diet fad. The reason that keto has been getting so much attention is because it helps significantly to manage your insulin levels. Very high insulin, very bad thing.”

Interesting, because the keto diet holds a special place among the fad diets as a kind of "super diet" or "lifestyle" that not only helps you lose weight (many people will argue help you keep it off but with crash diets that is almost never the case) but also been suggested to help with other health problems.

Conditions associated with high insulin levels like polycystic ovary syndrome, Type 2 diabetes, and infertility may consider the diet, Michaels says it doesn’t make sense for most people. “If you’re not eating a bunch of processed carbs and processed sugar and you’re not eating too much food in general, you won’t have insulin levels that are going through the roof,” she says.

In the video the 44-year-old went on to add that fads like the ketogenic diet—which has been praised by stars like Kourtney Kardashian and Halle Berry (who is a diabetic)—might influence people to think they “can eat whatever” in terms of quantity of food, when in fact the opposite is true.

“Calorie management and calorie restriction is less oxidative stress, so it’s far better for aging and being healthier.”

Michaels promises the secret to looking and feeling your best doesn’t have to be overcomplicated. “Do not go keto. Just work out, eat clean and don’t overeat. I promise you, balanced diet,” she says. “It’s that simple.”

If you're still keen to diet, Jillian says exercise matters more. According to Michaels, weight loss is 80 percent exercise and 20 percent diet. She says that you can't "starve the weight off", because that will shut down your metabolism down. Instead, she says you need to exercise it off by creating "an energy deficit".

When it comes to weight maintenance, Michaels says the formula is switched: for this you switch to 80 percent diet, 20 percent exercise. She says this because if you're not overeating, you won't gain weight. Michaels does, however, make the point that this doesn't necessarily mean you'll be healthy or in good shape.

"I know people that never overeat... Their body fat percentage might be higher, they might not have a ton of lean muscle, and they might not necessarily be healthy, but they won't gain weight," she says. While it's not entirely in black and white, the basis of this theory is excellent to build on.

You could follow Jillian and her sound advice or come to peace with the fact that maybe a "beach-body" isn't all that is cracked up to be.