The talented singer-songwriter shocked fans when this photo emerged earlier this yearCredit: BackGrid
The Sirtfood Diet encourages slimmers to eat plant foods such as kale and buckweat.
These foods, known as sirtuin activators, suppress appetite and activate the body’s “skinny gene”.
Sirtuin activators are also believed to protect cells in the body from dying under stress and are meant to regulate inflammation, metabolism and the ageing process.
The Sirtfood Diet allows slimmers to eat dark chocolate and drink red wine, as they are high in sirtuins.
Speaking to Insider, Goggins said people need to understand how the recommended foods instruct your body to use calories, rather than focusing on how many calories you consume each day.
“There’s so much focus on what foods you shouldn’t be eating, reducing calories and making people afraid to eat.
“But you only get the benefits of foods by eating them, so it’s always been diet of inclusion.”
The diet includes a seven-day phase which is optional to those taking part in the plan.
Whilst dieters are in this phase, three days are limited to 1,000 calories.
During the other days dieters can consume 1,500 calories.
Tips for weight loss success
Lots of us eat and drink more than we realise and do little physical activity. The result is often weight gain.
To lose weight, we need to change our current habits. This means eating less – even when eating a healthy, balanced diet – and getting more active.
Fad diets and exercise regimes that result in rapid weight loss are unlikely to work for long, because these kinds of lifestyle changes cannot be maintained. Once you stop the regime, you’re likely to return to old habits and regain weight.
The NHS’ top tips for success are:
Make realistic changes to your diet and physical activity that can become a part of your regular routine
The best way to lose weight is to make long-term changes to diet and physical activity that result in a steady rate of weight loss
Aim to lose weight at around 0.5kg to 1kg a week (1lb to 2lb), until you achieve a healthy body mass index (BMI)
Despite the fact that this phase is part of the diet, Goggins said this isn’t what leads people to the type of weight loss success that we have all seen with Adele.
Adele is said to have shed a whopping seven stone on the diet and Goggins said it was “unfair” that reports put the success down to the lower 1,000 limit.
Goggins said research behind the diet is key as it belies ideas that all calories are equal.
He added: “Just looking at calories and macros is missing a really key point of what the body does with them.”
The foods included in the diet have been hailed as being part of some of the best diets in the world.
Greens, red wine and olive oils all feature heavily in the Mediterranean diet.
People who are in the Blue Zone are more likely to have taken on this type of diet throughtout their lives.
Blue Zones are areas of the world where the most centurians live.
Sardinia in Italy is in the Blue Zone and many residents put their long lives down to the foods they consume.
Exercise is also said to have played a role in Adele’s weight loss and she is believed to have been following Joe Wick’s workouts.
Adele has increasingly been training at home following her high-profile split from husband Simon Konecki, 45, in April 2019.
She is also a fan of personal trainer Dalton Wong, who helps actors get into shape for roles, including her pal Jennifer Lawrence.