The Sirtfood Diet is built around a specific group of plant-rich foods called sirtfoods, which are high in natural compounds called polyphenols that activate proteins in the body known as sirtuins. Sirtuins are sometimes called the body’s “skinny gene” enzymes because they regulate fat burning, inflammation, metabolism, and cellular repair in ways that mimic the effects of fasting and exercise at a biochemical level, without the restriction or physical exertion those approaches require.
The diet was developed by nutritionists Aidan Goggins and Glen Matten and became widely known after Adele credited it during her weight loss. It centers on 20 key sirtfoods and involves two phases: a calorie-restricted Phase 1 lasting one week that combines green juices with sirtfood-rich meals, followed by a less restrictive Phase 2 maintenance period where sirtfoods become the foundation of everyday eating.
Research published in the journal Nutrients confirms that polyphenol-rich foods activate sirtuin pathways that regulate energy metabolism and have demonstrated anti-inflammatory and metabolic benefits in clinical studies. The British Dietetic Association notes that while the initial weight loss in Phase 1 is partly attributable to calorie restriction, the long-term dietary pattern of sirtfood-rich eating is well-aligned with established healthy eating guidelines.
This is the complete beginner’s guide to what sirtfoods are, how the diet works, and the full sirtfood grocery list you need to get started.
What Are Sirtuins and Why Do Sirtfoods Work?
Sirtuins are a family of seven proteins (SIRT1 through SIRT7) that act as master regulators of metabolism, inflammation, and aging processes in the body. When activated, they stimulate fat burning, enhance muscle efficiency, reduce inflammation, and improve insulin sensitivity. Naturally, sirtuin activity is triggered by calorie restriction and vigorous exercise, both of which most people struggle to sustain consistently.
Sirtfoods activate these same pathways through the polyphenols they contain, including resveratrol in red wine and grapes, quercetin in onions and apples, kaempferol in kale and rocket, and oleuropein in olive oil. A study published in Cell Metabolism found that sirtuin activation through dietary polyphenols supported fat oxidation, reduced oxidative stress, and improved markers of metabolic health without requiring caloric restriction.
The practical implication for weight loss is straightforward: eating a diet built around sirtfoods gives your body the biochemical signals it would normally receive only through fasting or intense exercise, making fat burning more efficient even at moderate calorie intake.
The 20 Key Sirtfoods
The original Sirtfood Diet identifies 20 foods as the core sirtfoods because they contain the highest concentrations of sirtuin-activating polyphenols. These are the foods to prioritize above all others on this diet.
- Kale
- Red wine (in moderation; one to two glasses with meals)
- Strawberries
- Onions
- Extra virgin olive oil
- Dark chocolate (85% cocoa or higher)
- Matcha green tea
- Buckwheat
- Turmeric
- Walnuts
- Rocket (arugula)
- Bird’s eye chilies
- Lovage (an herb; parsley is a widely available substitute)
- Medjool dates
- Red chicory
- Blueberries
- Capers
- Coffee
- Parsley
- Soy (tofu, miso, tempeh, edamame)
These 20 foods are the non-negotiables. Build your meals around as many of them as possible in every phase of the diet.
How the Sirtfood Diet Works: Phase 1 and Phase 2
Phase 1 (Days 1 to 7)
Phase 1 is the intensive week designed to kickstart weight loss and sirtuin activation.
Days 1 to 3:
- 3 sirtfood green juices per day
- 1 solid sirtfood-rich meal per day
- Total calories: approximately 1,000 per day
Days 4 to 7:
- 2 sirtfood green juices per day
- 2 solid sirtfood-rich meals per day
- Total calories: approximately 1,500 per day
The green juice is a specific recipe central to Phase 1. It contains kale, rocket, parsley, celery, green apple, lemon juice, matcha green tea, and ginger. This combination delivers a concentrated dose of sirtuin-activating polyphenols first thing in the morning and between meals.
Phase 1 Green Juice (makes 1 serving):
- 75g kale
- 30g rocket (arugula)
- 5g flat-leaf parsley
- 2 to 3 stalks celery including leaves
- Half a green apple
- Half a lemon, juiced
- Half a teaspoon matcha green tea powder
- Small piece of fresh ginger
Juice the kale, rocket, parsley, celery, and apple. Stir in the lemon juice and matcha at the end. Do not blend; the juice needs to be strained to reduce fiber content, which would slow absorption of the polyphenols.
Phase 2 (Weeks 2 and 3)
Phase 2 moves away from calorie restriction and into a sustainable sirtfood-rich eating pattern.
- 3 balanced sirtfood-rich meals per day
- 1 optional sirtfood green juice per day
- No strict calorie target; eat to comfortable fullness from sirtfoods and whole foods
- One to two glasses of red wine with dinner are encouraged rather than discouraged
After Phase 2, the intention is that sirtfood eating becomes a permanent lifestyle approach rather than a temporary diet.
Complete Sirtfood Diet Foods List
Vegetables
All 20 key sirtfoods include several vegetables, and many additional vegetables support the diet’s goals through their own polyphenol content.
Core sirtfood vegetables:
- Kale (the single most important sirtfood; use in juices, salads, and cooked dishes)
- Rocket (arugula)
- Red onions (higher polyphenol content than white onions)
- White onions
- Red chicory
- Bird’s eye chilies (fresh or dried)
- Celery with leaves (the leaves contain most of the polyphenols)
- Capers (fresh or brined)
- Lovage (use flat-leaf parsley as a substitute if unavailable)
- Parsley (flat-leaf; use abundantly)
Additional beneficial vegetables:
- Broccoli
- Spinach
- Asparagus
- Green beans
- Leeks
- Garlic
- Artichokes
- Endive
- Watercress
- Shallots
- Swiss chard
- Pak choi (bok choy)
- Beetroot
Fruits
- Strawberries (a core sirtfood; eat daily)
- Blueberries (a core sirtfood; eat daily)
- Medjool dates (a core sirtfood; use as natural sweetener in recipes and smoothies)
- Green apple (used in the green juice)
- Red grapes (contain resveratrol, the same polyphenol in red wine)
- Blackcurrants
- Raspberries
- Blackberries
- Goji berries
- Plums
- Cherries
Proteins
Soy-based proteins are the only core sirtfood proteins. The isoflavones in soy are potent sirtuin activators and make tofu, miso, and edamame essential components of this diet.
Core sirtfood proteins:
- Tofu (firm and silken; used in stir-fries, scrambles, and soups)
- Miso paste (white or red; use in soups, marinades, and dressings)
- Tempeh (fermented soy; higher protein than tofu)
- Edamame (fresh or frozen, shelled)
- Soy milk (unsweetened)
Additional protein sources:
- Chicken breast (skinless)
- Turkey breast (skinless)
- Eggs
- Salmon and oily fish
- Shrimp
- Beef (lean cuts; eaten in moderation)
- Lentils
- Chickpeas
- Black beans
- Kidney beans
- Greek yogurt (plain, full-fat)
Whole Grains
- Buckwheat (a core sirtfood and the grain most emphasized in this diet; use in porridge, salads, and as a rice substitute)
- Oats (rolled or steel-cut)
- Quinoa
- Brown rice
- Whole wheat bread (100% whole grain)
- Whole wheat pasta
- Barley
Note on buckwheat: Despite its name, buckwheat is not wheat and is gluten-free. It contains rutin and quercetin, two of the most potent sirtuin-activating polyphenols. Buckwheat noodles (soba noodles; check label for 100% buckwheat versions) are an excellent way to incorporate it into everyday meals.
Fats and Oils
- Extra virgin olive oil (a core sirtfood; use as the primary cooking fat and dressing base)
- Walnuts (a core sirtfood; eat a small handful daily)
- Walnut oil (for dressings; do not heat)
- Avocado (good supporting fat; pairs well with sirtfood meals)
- Almond butter (no added sugar)
- Tahini
Beverages
Three of the 20 core sirtfoods are beverages, making what you drink as important as what you eat on this diet.
Core sirtfood beverages:
- Matcha green tea (a core sirtfood; the most concentrated source of EGCG, a powerful sirtuin activator; drink 2 to 3 cups daily; use ceremonial or culinary grade)
- Coffee (a core sirtfood; drink black or with unsweetened plant milk; 2 to 3 cups daily; both regular and decaffeinated provide chlorogenic acid)
- Red wine (a core sirtfood; 1 to 2 glasses per day with meals; contains resveratrol; optional for those who do not drink alcohol)
Additional beneficial beverages:
- Green tea (lower polyphenol concentration than matcha but still beneficial)
- Tart cherry juice (unsweetened)
- Green juices (the sirtfood green juice recipe above)
- Water (aim for 8 cups per day minimum)
- Herbal teas
Note on red wine: Red wine is included in the original Sirtfood Diet as a genuine dietary tool, not a concession. The resveratrol in red wine is one of the most studied sirtuin activators available. Non-drinkers can obtain resveratrol from red grapes, blueberries, and dark chocolate.
Herbs, Spices, and Condiments
- Turmeric (a core sirtfood; use in cooking daily; pair with black pepper which increases curcumin absorption by up to 2,000%)
- Bird’s eye chilies (fresh or dried flakes; add heat and sirtuin-activating compounds to any dish)
- Parsley (flat-leaf; use generously in juices, salads, and as a garnish)
- Capers (add to salads, fish dishes, and pasta)
- Ginger (fresh; used in the green juice and many sirtfood recipes)
- Garlic
- Cinnamon
- Cumin
- Smoked paprika
- Fresh herbs: basil, mint, coriander, thyme, rosemary, chives
- Soy sauce or tamari (low-sodium)
- Apple cider vinegar
- Lemon juice (fresh)
Dark Chocolate
Dark chocolate containing 85% cocoa or more is a core sirtfood. The flavanols in high-percentage dark chocolate activate SIRT1 and reduce inflammation. Research published in The American Journal of Clinical Nutrition found that regular consumption of high-cocoa dark chocolate improved insulin sensitivity and reduced markers of oxidative stress.
A recommended daily portion is 10 to 15g (one to two squares) of 85% or higher cocoa dark chocolate. This is not a cheat; it is part of the diet.
Foods to Avoid on the Sirtfood Diet
The Sirtfood Diet does not have a long list of forbidden foods, but several categories undermine sirtuin activation and should be minimized or eliminated.
- Refined sugars and processed sweets — spike blood sugar, promote inflammation, and suppress the metabolic pathways that sirtuins activate
- Refined grains — white bread, white pasta, white rice; replace with buckwheat, oats, quinoa, and whole grain versions
- Ultra-processed foods — packaged snacks, fast food, processed meats, and ready meals regardless of what their labels claim
- Cheap vegetable oils — sunflower oil, canola oil, corn oil, and margarine; replace entirely with extra virgin olive oil
- Sugary drinks — sodas, fruit juice, sweetened teas, and energy drinks; replace with matcha, coffee, green tea, and water
- Excessive alcohol — beyond the one to two glasses of red wine that form part of the diet, additional alcohol counteracts sirtuin activation
- Low-cocoa chocolate — milk chocolate and white chocolate contain negligible polyphenols; only 85% cocoa or higher counts as a sirtfood
Sirtfood Diet Grocery List for Beginners
This list covers the first two weeks of the Sirtfood Diet including Phase 1 ingredients. Quantities are for one person.
Produce
Core sirtfood vegetables and herbs:
- Kale (2 large bags; needed daily for green juice and meals)
- Rocket / arugula (2 bags)
- Flat-leaf parsley (3 bunches)
- Red onions (1 bag)
- White onions (1 bag)
- Celery with leaves attached (2 bunches)
- Bird’s eye chilies, fresh (1 small bag) or dried chili flakes (1 jar)
- Capers (1 small jar)
- Fresh ginger (1 large piece)
- Fresh turmeric (1 piece, optional; ground turmeric also fine)
- Garlic (2 bulbs)
- Shallots (4 to 5)
- Broccoli (2 heads)
- Asparagus (1 bunch)
- Spinach (1 bag)
- Beetroot (4 medium)
- Leeks (2)
- Watercress (1 bag)
Fruits:
- Strawberries (2 punnets fresh or 1 large bag frozen)
- Blueberries (2 punnets fresh or 1 large bag frozen)
- Medjool dates (1 small pack, 8 to 10 dates)
- Green apples (6; for juicing)
- Red grapes (1 bunch)
- Lemons (6; for juicing)
- Blackberries or raspberries (1 punnet)
- Avocados (4)
Proteins
- Firm tofu (3 x 400g blocks)
- Silken tofu (1 block; for smoothies and sauces)
- Tempeh (1 to 2 packages)
- Frozen shelled edamame (1 large bag)
- Chicken breasts skinless (500g)
- Salmon fillets (2 to 3 portions)
- Eggs (1 dozen)
- Canned chickpeas (2 cans, low-sodium)
- Canned lentils or dried red lentils (1 can or 1 lb bag)
- Plain full-fat Greek yogurt (500g tub)
Grains
- Buckwheat (500g; look in health food section or international aisle)
- Buckwheat soba noodles (1 to 2 packs; check label for 100% buckwheat)
- Rolled oats (large container)
- Quinoa (500g)
- Brown rice (1 kg)
Fats and Oils
- Extra virgin olive oil (1 large bottle; you will use this daily)
- Walnuts (200g)
- Walnut oil (1 small bottle; for dressings)
- Almond butter, no added sugar (1 jar)
- Tahini (1 jar)
Beverages
- Matcha powder (ceremonial or culinary grade; 1 tin or 30g bag; buy a quality brand as cheap matcha is bitter)
- Ground coffee or whole beans (regular or decaffeinated)
- Red wine (optional; choose a dry red such as Pinot Noir, Malbec, or Cabernet Sauvignon for highest resveratrol)
- Green tea bags (1 box)
- Herbal tea assortment (1 box)
Pantry
- Miso paste (white or yellow; 1 container)
- Low-sodium soy sauce or tamari (1 bottle)
- Dark chocolate 85% cocoa or higher (3 to 4 bars)
- Apple cider vinegar (1 bottle)
- Balsamic vinegar (1 bottle)
- Dijon mustard (1 jar)
- Canned diced tomatoes, no added salt (2 cans)
- Low-sodium vegetable broth (2 cartons)
- Unsweetened soy milk (1 to 2 cartons)
- Ground turmeric (1 jar)
- Ground cumin (1 jar)
- Black pepper (freshly ground)
- Cinnamon (1 jar)
- Smoked paprika (1 jar)
- Dried chili flakes (if not using fresh bird’s eye chilies)
Frozen
- Frozen shelled edamame (listed also under proteins)
- Frozen blueberries (1 large bag)
- Frozen strawberries (1 large bag)
Tips for Beginners Starting the Sirtfood Diet
Invest in a cold-press juicer before Phase 1. The green juice is central to Phase 1 and cannot be made properly in a blender. A cold-press juicer extracts juice while leaving fiber behind, which is required for optimal polyphenol absorption. A mid-range juicer is sufficient; you do not need anything high-end.
Buy quality matcha. Cheap matcha is often made from older leaves, is bitter, and has significantly lower EGCG content than ceremonial or high-quality culinary grade matcha. Look for a bright, vibrant green color. Dull or yellowish matcha is old and weak.
Do not skip turmeric and black pepper together. The curcumin in turmeric is poorly absorbed on its own. Black pepper contains piperine, which increases curcumin bioavailability dramatically. Always pair them.
Use celery leaves, not just the stalks. The sirtuin-activating polyphenols in celery are concentrated in the leaves, which most people discard. Buy celery bunches with the leaves intact and use the whole plant in your juices.
Phase 1 is intentionally difficult. Three green juices and one meal a day at 1,000 calories is a significant restriction. Most people experience hunger, mild headaches, and low energy in the first two to three days as the body adjusts. This is normal and temporary. Stay hydrated, keep busy, and push through to day four when the protocol becomes easier.
Stock dark chocolate and dates for cravings. The Sirtfood Diet is unique in that both dark chocolate and Medjool dates are legitimate diet foods. When sugar cravings hit, two squares of 85% dark chocolate or one or two Medjool dates with walnuts are on-plan, satisfying choices.
Prepare the green juice the night before. Making three juices per day during Phase 1 is time-consuming. Juice a full batch the night before and store in sealed glass jars in the refrigerator for up to 24 hours. Polyphenol content degrades slightly with storage but remains effective.
The Bottom Line
The Sirtfood Diet works by centering your eating around 20 polyphenol-rich foods that activate sirtuin proteins in the body, triggering fat burning, reducing inflammation, and improving metabolic function through the same pathways activated by fasting and exercise. For beginners, the priority is learning the 20 core sirtfoods (especially kale, rocket, matcha, red wine, dark chocolate, buckwheat, walnuts, soy, strawberries, and blueberries), building daily habits around them, and completing the two-phase protocol before transitioning to sirtfood-rich eating as a long-term lifestyle. The grocery list above gives you everything needed for a full two weeks. Start with the green juice, make extra virgin olive oil your default cooking fat, eat dark chocolate without guilt, and let the 20 sirtfoods do the work.
This article is for informational purposes only and does not constitute medical or dietary advice. Always consult a registered dietitian or healthcare provider before beginning a new diet, particularly one involving significant calorie restriction in Phase 1.
