We’re all fascinated by celebrities. We study their every move: what they wear, what their skin care routine is, what they eat.

As dietitians, we know that nutrition can be overwhelming and it’s easy to look to celebs for diet advice. After all, they look fabulous, and if it works for them, shouldn’t it work for us? (Aside from the fact that they have a trainer, dietician, and probably an unlimited food budget, we mean.)

Unfortunately, celebrities can fall victim to diet culture just like the rest of us, and they usually aren’t the best source for nutrition advice. Not to mention, they’re working in an image-focused industry that prioritizes looks over health. So maybe, just maybe, we shouldn’t take their diet advice after all. Need proof? Here are some trending celeb diets that may do more harm than good.

Adele’s Sirtfoods Diet

First question: what are sirtuins? Silent information regulators, or SIRTs, are enzymes that regulate pathways in the body that may boost metabolism and reduce inflammation. The creators of the Sirtfood Diet claim that certain foods like blueberries, kale, and dark chocolate contain antioxidants that increase SIRT activity, thus helping you burn fat more effectively. Apparently, you can lose seven pounds in seven days by following the Sirtfood diet. 

Sound too good to be true? It is…

There is some evidence that SIRTs may benefit your metabolism, but the research on SIRTs is actually stronger when it comes to aging and longevity. More importantly, there is no research that specific foods activate the SIRT enzymes per se. Yes, some antioxidants in food stimulate SIRT activity, but it would take an exorbitant amount of those foods to make this happen—much more than you can reasonably eat in a day.

Another kicker: the first phase of the Sirtfoods diet requires a pretty extreme calorie restriction: 1,000 calories a day for three days, mostly coming from juices. No thanks.

RD verdict: Even if SIRTs help burn fat, we probably can’t enhance their activity by eating normal portions of so-called “sirtfoods”. Any weight loss you see on this diet is probably from limiting your calories and eating nutrient-dense foods. While the Sirtfoods diet is rich in healthy foods we love, it’s basically a calorie restricted Mediterranean diet repackaged and sold with another name. Good thing the Mediterranean diet already exists, doesn’t rely on intense calorie restriction, and has proven benefits.

The Kardashians’ Flat Tummy Tea

The creators of Flat Tummy Tea claim that it “aids in the detoxifying and digestion process”. This word “detox” is used a lot in diet culture, but what does it really mean?

Your kidneys, liver, and digestive systems metabolize and help eliminate harmful substances from your body, also known as detoxification. While some herbs may help to support these processes, your organs are pretty effective at doing them on their own, so you really don’t need a tea to do what your organs were built to do.

Another important caveat: one of the main ingredients in this tea is senna leaf, a potent laxative that can actually alter your gastrointestinal motility and potentially do irreversible damage if used in the long term. Eek! That’s not detox—that’s diarrhea. Pass.

RD verdict: The best way to get a flat tummy, if that’s one of your goals, is by eating a whole foods diet, limiting alcohol, controlling your blood sugar with regular, balanced meals, drinking lots of water, and eating foods that are rich in fiber and probiotics. While you’re at it, add in 30 minutes of movement per day and voilà, a flat tummy—no harmful laxatives necessary. 

Beyoncé’s Master Cleanse

The Master Cleanse, also called the Lemonade Diet, is a liquid-only diet consisting of four ingredients: water, lemons, maple syrup, and cayenne pepper. Proponents of the Master Cleanse (which also include celebs like Michelle Rodriguez and Demi Moore) claim that the specific combination of these ingredients helps detoxify the body and support weight loss. Spoiler: any diet that promotes you consume nothing but a lemonade mix for days on end is not going to be good for you, and if you need more convincing, check out this account from a brave soul who tried it.

RD verdict: While it might be true that short-term liquid fasting gives your digestive and detoxification systems a little break to work more efficiently in the future, a liquid diet usually leads to binge and overeating which taxes your detox systems even more! 

Yes, there’s some evidence that spicy foods like cayenne pepper may slightly boost your metabolism, but any weight loss you see from doing this diet is likely from the severe calorie restriction from not eating. If you have enough willpower to drink this concoction, why not adopt a healthy diet and get more exercise? It’s more effective and sustainable for long-term weight loss and supports overall health. 

The hard truth about celebrities is that they look fabulous because they have the money for chefs, personal trainers, and dietitians to help them eat and exercise for their personal and professional weight goals. They are not qualified to give nutrition advice, but if asked, most of them will tell you that the secret to feeling and looking great is not a fancy tea, but a healthy, balanced diet with regular exercise.

Vanessa Rissetto and Tamar Samuels are registered dietitians and co-founders of Culina Health, offering nutritional coaching and a science-based health and wellness education. Taking the complicated diets, numbers, and more out of nutrition, Vanessa and Tamar simplify healthy eating ideals and plans in order to stop stressing about food and start living life. Vanessa has over ten years of experience as a RD, and currently serves as the dietetic intern director at New York University. Tamar is a RD and National Board-Certified Health & Wellness Coach, with a unique and holistic approach that integrates functional medicine, positive psychology, and behavioral change techniques.

Images: Kathy Hutchins / Shutterstock.com