Reports say the singer has dropped around 14kg from her 179cm frame, thanks to the recently released book The Sirtfood Diet.
Adele’s longtime trainer Pete Geracimo is said to be a fan of the meal plan which focuses on foods that activate sirtuins, ‘skinny gene’ proteins in your body that reportedly regulate metabolism.
Co-authors Glen Matten, a certified nutritionist who specialises in nutritional medicine, and Aidan Goggins, a nutritionist and pharmacist, focus on 20 “sirtfoods” that are rich in sirtuin-activating polyphenols, which Glen says “mimic the effects of exercise and fasting.”
The fat-shedding foods are your typical healthy-hitters. Dieters nosh on kale, strawberries, dates, olive oil and dark chocolate while drinking green tea, coffee and red wine, among other plant-based treats.
Meat is not considered a sirtfood, but dieters are allowed to consume it; the plan focuses on adding sirtfoods to your diet but doesn’t prohibit other foods.
For the first three days, followers are limited to just 1000 calories: one sirtfood-heavy meal recipe from the book (such as salmon with greens, or buckwheat noodles with tofu and vegetables) and three matcha and kale-packed green juices.
For the next four days, the daily allowance is increased to 1500 calories, with two sirtfood-focused meals and two juices.
After that seven-day entry period, followers eat as many sirtfood-heavy meals as they like.
Glen says that after the first week, the diet is more of a gradual shift than a total overhaul, and he hopes readers make small lifestyle changes instead of going all-out and failing.
“Our ambition is that in the long term, people are adjusting diets to include these ingredients,” he says.
Even so, the immediate weight-loss on this plan is pretty dramatic, report many users.
One study group lost an average of 3kg in the first seven days, says Glen, and looked more toned as a result.