When Adele's transformation made global headlines, the Sirtfood Diet was the most cited approach. Created by nutritionists Aidan Goggins and Glen Matten, it centres on foods that activate proteins called sirtuins — sometimes called the body's 'skinny genes'.
What Are Sirtuins?
Sirtuins (specifically SIRT1) regulate fat metabolism, inflammation, and cellular health. They're activated by calorie restriction, exercise, and polyphenols found in specific plant foods. The Sirtfood Diet exploits this link between polyphenol intake and sirtuin activation.
The Top 20 Sirtfoods
- Kale, rocket and parsley
- Red onions and capers
- Blueberries and strawberries
- Dark chocolate (85%+ cocoa)
- Matcha and green tea
- Extra virgin olive oil and walnuts
- Coffee and turmeric
- Buckwheat and medjool dates
- Celery, bird's eye chilli and lovage
How the Diet Works
Phase 1 (Days 1-7): 1,000 kcal/day for days 1-3 (three green juices plus one sirtfood meal); 1,500 kcal/day for days 4-7 (two juices plus two meals). Phase 2 (Weeks 2-4): Three balanced sirtfood-rich meals daily plus one green juice.
The Signature Green Juice Recipe
Does the Science Support It?
A pilot study in JISSN found participants lost ~7 lbs in week one. Most nutrition scientists attribute this to the calorie restriction rather than sirtuin activation alone. The real long-term value is shifting toward nutrient-dense, anti-inflammatory whole foods — closely resembling the Mediterranean diet, one of the most evidence-backed dietary patterns in the world.
Is It Safe?
Phase 1's 1,000-calorie restriction should only be undertaken under medical supervision. Not suitable for pregnant women, people with eating disorders, those with diabetes on medication, or adolescents. The maintenance phase is appropriate for most healthy adults.