In 2020, pop diva Adele gave her fans a huge shock when she revealed a picture of her looking svelte and shared her dramatic weight loss journey. The ‘Rolling In The Deep’ singer had lost a whopping 45 kg (100 pounds) in just two years

“People are shocked because I didn’t share my ‘journey.’ They’re used to people documenting everything on Instagram, and most people in my position would get a big deal with a diet brand,” she said. “I couldn’t give a flying f***. I did it for myself and not anyone else. So why would I ever share it? I don’t find it fascinating. It’s my body." she told British Vogue in 2021.

For years, speculation has surrounded the eating habits of singer Adele, with many reports suggesting that she follows the Sirtfood Diet, a nutrition plan inspired by the book of the same name. An analysis by Today.com explored the dietary approach, which emphasizes foods believed to support cellular health and influence the body's natural metabolic processes.

The Sirtfood Diet was created by nutrition experts Aidan Goggins and Glen Matten. The eating plan is designed around the concept of stimulating sirtuins, a group of proteins that help regulate several biological functions. These enzymes are involved in the body's response to metabolic activity and various forms of physiological stress. According to the creators, encouraging the activity of these proteins may contribute to improved cellular function and overall wellness.

The diet highlights a wide variety of plant-based ingredients that are commonly available. Recommended foods include leafy vegetables such as kale, arugula and parsley, along with strawberries, walnuts and extra virgin olive oil. Other staples include dark chocolate, spices commonly used in curry preparations, green tea, coffee and even moderate amounts of red wine. These foods are considered rich in compounds that may support sirtuin activity and are intended to be incorporated regularly into meals.

The first stage of the Sirtfood Diet spans seven days and begins with a strict calorie restriction. During the initial three days, participants are advised to consume approximately 1,000 calories daily. The plan consists of three servings of specially prepared Sirtfood green juice along with one meal featuring ingredients rich in sirtuin-supporting compounds.

From the fourth through the seventh day, daily calorie intake increases to around 1,500 calories. During this period, the meal structure changes to two green juices accompanied by two balanced meals containing Sirtfood ingredients. According to Goggins, followers of the program may lose up to seven pounds during the first week.

After completing the introductory week, participants move into a two-week maintenance stage. This phase is intended to promote gradual and sustainable weight management rather than rapid weight loss. Instead of following a highly restrictive meal schedule, individuals are encouraged to eat three balanced meals each day that feature Sirtfood ingredients, along with one serving of green juice.

The creators of the diet state that these two phases can be repeated whenever someone wants an additional boost in fat loss while continuing to include Sirtfood-rich ingredients as part of a balanced eating pattern.