When it comes to weight loss, most of us have an idea of what’s effective and what isn’t simply by reading celebrity weight loss secrets. After all, if there’s someone you can trust when it comes to successful dieting, it’s probably these celebrities that have lost weight and kept them off, right? Not really.

While there are great celebrity diets out there, particularly ones that won’t require us to starve ourselves, there are also weight loss tips that can do more harm than good. It might be tempting to follow these tips anyway especially when you see how much weight your favorite model has lost, but we’re here to tell you why some of the seemingly-best celebrity diets might actually be the worst.

The Brown Rice Advice

In an interview with V Magazine, Gwyneth revealed her vegetarian diet, which was eating a lot of brown rice to supply around 60 percent of her calories. It also consisted of naturally processed food items, vegetables, beans, and miso soup.

The star also said in the interview that her macrobiotic diet isn’t drastically different from her previous diet – which was eliminating meat from her life. Although this all sounds fine and dandy, studies have found that following a macrobiotic diet can result in a deficiency in vitamin D.

This is because this type of diet contains a very little amount of animal products, which are the most natural sources of vitamin D that our body can use.

The 5:2 Diet

Basically, what it is is a type of intermittent fasting, wherein you eat whatever you like for five days, and then restrict yourself to few than 500 calories for the other two days.

Celebrities like Jimmy Kimmel, Ben Affleck, and Beyonce have been known to utilize the diet to lose weight and keep it off.

Kimmel has lost over 30 pounds since he went on the diet. He broke down some of the details in an interview with a magazine and said, “On Monday and Thursday, I eat fewer than 500 calories a day, then I eat like a pig for the other five days. You ‘surprise’ the body, keep it guessing.”

However, scientists have found that the diet is anything but safe. An exaggerated calorie restriction isn’t an ideal and sustainable way to lose weight since it only puts the body in starvation mode. In effect, the body will be craving for what gives it energy – sugars and starch. If you’re not careful, you’re going to overeat on your unrestricted days anyway and pile on more junk into your body.

Eating Clay?

Divergent star Shailene Woodley swears by clay’s purifying and detoxifying properties to keep her healthy. It’s important to keep in mind that while consuming clay can pick up things from your system (like metals) and excrete them, it might put your health in jeopardy if it absorbs too much iron from your body.

In case you forgot, iron is an important component of hemoglobin, which makes up red blood cells. It’s the red blood cells that are in charge of carrying oxygen from your lungs and to the rest of your body. So basically, eating clay can be dangerous in terms it possibly getting rid of all the iron in your body, and you stop being able to breathe.

The Drunk Diet

Lady Gaga once revealed that she was on a drunk diet. She said she offsets the effects of alcohol by maintaining a workout routine, and by making sure she sticks to it no matter how hungover she gets.

Remember that there’s no harm in drinking in moderation, but it can definitely sidetrack you from your diet and all the hard work you put into your workouts!

Going Overboard with Juice Cleanses

We all recognize the benefits of juice cleansing, and some celebrities like the Kardashians and the Jenners are fans of tea detoxes. However, it’s important to remember that these juices are not substitutes for real food.

Nicole Richie has been known to do juice cleanses nearly every week. Despite all the vegetables and fruits thrown in there, these juices can still be loaded with sugar. Nothing bad about juicing as long as it’s made mostly of vegetables and as long as you keep eating healthy, good-for-your-body solid food.

Don’t live off of protein shakes, either!

Adriana Lima has been reported to consume only protein shakes with powdered egg nine days before every Victoria’s Secret Fashion Show. She doesn’t eat anything solid, drinks a gallon of water every day, and exercise twice a day.

An apple and canned tuna daily

For his role in The Machinist, Christian Bale lost 63 pounds by combining intense workouts and only eating an apple and a can of tuna fish daily. Nothing more needs to be said than, please, don’t starve yourself! The healthiest way to lose weight is mixing a better lifestyle, healthier diet, and workout regimens that work for your body.

The No-Nightshade Diet

You’ve probably heard about this one before, but Gisele Bündchen and Tom Brady’s diet is really ridiculous and has no basis whatsoever.

Although, yes, their diet consists of 80% plant-based foods and 20% lean meat, which is great. But the rest of their diet restrictions: no sugar, no dairy, no flour, no olive oil, and no nightshade plants like tomatoes, eggplants, and peppers sound totally bogus. Those three offer so many healing properties! And for some unknown reason, Tom Brady will never eat strawberries. Ever.

We appreciate the fact that overall they seem to be in a great diet, but restricting foods for no apparent reason doesn’t sound very… well, reasonable.

What about you? What’s the  most ridiculous celebrity weight loss fad you’ve heard of?