Does it break a fast?

A tablespoon of apple cider vinegar has about 3 kcal. Diluted in water, it is safe for weight loss and blood sugar and grey for the other goals.

Aspartame adds almost no calories in the amounts used. Its sweet taste makes it a grey area for every fasting goal in this database.

BCAAs break a fast for autophagy. At about 20 calories per 5 g with no sugar, they are a grey area for weight loss, gut rest and blood sugar.

Yes. A 355 ml can of regular beer has about 150 kcal from alcohol and carbohydrate, so it breaks a fast for every goal.

No. Black coffee has about 2 kcal a cup and no sugar, so it keeps a fast for weight loss, blood sugar and autophagy. Gut rest is a grey area.

No. Plain black tea has about 2 kcal a cup, no sugar and nothing to digest, so it is safe for every fasting goal. Milk and sugar change that.

Bone broth has protein and about 15 to over 100 kcal a cup, so it breaks autophagy and gut-rest fasts. It is grey for weight loss.

A sugar-free mint has about 0.5 to 1 kcal and no sugar. Its sweet taste makes it a grey area for every fasting goal, blood sugar included.

Yes, for most goals. Butter and MCT oil take bulletproof coffee to about 230 kcal, which breaks weight-loss, autophagy and gut-rest fasts.

Yes. A tablespoon of chia seeds is about 58 kcal of fat, protein and fibre. That breaks a fast for weight loss, autophagy and gut rest.

Smoking adds no calories, so it does not break a fast by calories alone. This site never marks tobacco as safe for any fasting goal.

Not for weight loss or blood sugar. A teaspoon of ground cinnamon has about 6 kcal, and a sprinkle in coffee has under 2 kcal.

Yes, for most goals. A 240 ml cup has about 45 kcal and 6 g of sugar, which breaks a fast for blood sugar, autophagy and gut rest.

A splash of milk (about 15 kcal) is a grey area for weight loss and blood sugar. Any milk breaks a fast for autophagy and gut rest.

A tablespoon of heavy cream has about 50 kcal. It is safe for blood sugar, grey for weight loss, and breaks autophagy and gut-rest fasts.

A 10 g scoop of collagen has about 35 kcal, all from protein. It is grey for weight loss and blood sugar and breaks autophagy and gut-rest fasts.

No. Plain creatine monohydrate adds no sugar, fat or protein, so the database marks it safe for all four fasting goals. Sugary blends differ.

Plain, strained cumin (jeera) water has very few calories, so it is safe for weight loss and blood sugar. Honey or sugar in it breaks a fast.

No. Black decaf coffee has 0 to 2 kcal a cup and no sugar, so it is safe for weight loss, blood sugar and autophagy. Gut rest is a grey area.

A can of diet soda has 0 to about 7 kcal, too few to matter much for weight loss. Its sweet taste makes it a grey area for every goal.

Erythritol counts as 0 kcal and barely affects blood sugar. Like every sweetener on this site, it is a grey area for all four fasting goals.

A 1 g fish-oil capsule has about 9 calories of fat. It is fine for weight loss and blood sugar, breaks an autophagy fast and is grey for gut rest.

Yes. A medium apple has about 95 kcal and 19 g of sugar, so whole fruit breaks a fast for every goal. A banana has about 105 kcal.

No. Plain green tea has about 2 kcal a cup and no sugar, so it is safe for every fasting goal. Sweetened bottled green tea is a different drink.

No. Plain herbal teas such as peppermint, chamomile and hibiscus have 0 to 2 kcal a cup, which makes them safe for every fasting goal.

Yes. A tablespoon of honey has about 64 kcal and 17 g of sugar. That breaks a fast for every goal, even stirred into hot water or tea.

Ibuprofen tablets have no calories, so they do not break a fast. Take them ideally with or after food, as ibuprofen can upset the stomach.

A 240 ml cup of kombucha has about 40 to 60 kcal and 7 to 12 g of sugar. It breaks most fasts and is a grey area for weight loss.

A squeeze of lemon adds about 1 kcal, so lemon water is safe for weight loss, blood sugar and gut rest. Autophagy is a grey area.

No. A levothyroxine tablet has no calories and does not break a fast. It is taken on an empty stomach, so it sits easily inside a morning fast.

No. A plain magnesium tablet or capsule has almost no calories and no sugar, so it keeps you fasted for every goal.

Yes, for most goals. A tablespoon of MCT oil is about 130 kcal of fat, so it breaks a fast for weight loss, autophagy and gut rest.

Metformin tablets have no calories and do not break a fast. Most people take it with food, so take it as prescribed and fit the fast around it.

Monk fruit sweetener has 0 kcal, but its sweet taste makes it a grey area for every fasting goal. Many packets are mainly erythritol.

No. Mouthwash used as directed and spat out does not break a fast. You swish it and spit it, so nothing reaches your stomach.

No. A standard multivitamin tablet has almost no calories (under 5), so it keeps you fasted. Gummy vitamins made with sugar do break a fast.

Nicotine gum adds only a few calories, too few to matter much for weight loss. Its sweet taste makes it a grey area for every fasting goal.

A 50 ml splash of oat milk has about 23 kcal and some sugar. It is grey for weight loss and breaks blood-sugar, autophagy and gut-rest fasts.

Yes. A tablespoon of olive oil has about 120 kcal, so it breaks a fast for weight loss, autophagy and gut rest. It barely touches blood sugar.

No. Paracetamol (acetaminophen) tablets have no calories and can be taken with or without food, so they keep you fasted for every goal.

A dill pickle spear has about 3 kcal, so it is safe for a weight-loss fast. It is still food, so it breaks a fast for autophagy and gut rest.

Pre-workout can break a fast. A sugar-free caffeine formula is grey at worst, sugar breaks a blood-sugar fast and amino acids break autophagy.

No. Salt has no calories, sugar or protein, so a pinch in water is safe for every fasting goal. It still counts towards your daily sodium.

No. Plain sparkling water has 0 kcal, no sugar and no sweetener, so it is safe for every fasting goal. Tonic water is a sweet drink and breaks a fast.

Yes. A 25 ml measure of vodka, gin or whisky has about 55 kcal from alcohol, so spirits break a fast. No level of alcohol is safe for health.

No. Statin tablets have no calories and do not break a fast. Simvastatin and atorvastatin can be taken with or without food.

Pure liquid stevia has 0 kcal, but its sweet taste makes it a grey area for every fasting goal. Some packets add up to about 4 kcal of dextrose.

Sucralose adds almost no calories, but it is a grey area for every fasting goal. In trials it changed blood-sugar responses in some people.

Yes for blood sugar, autophagy and gut rest. A teaspoon is about 16 calories, so for weight loss it is a grey area that adds up fast.

Sugar-free creamer has about 15 to 20 kcal a tablespoon, mostly from fat. It is a grey area for weight loss and breaks a strict fast.

A piece of sugar-free gum has about 3 to 5 kcal, too few to matter much for weight loss. Its sweet taste makes it a grey area for every goal.

Sugar-free coffee syrup is about 0 kcal per 2 tbsp, but the sweet taste makes it a grey area for every goal. Pancake syrups have about 15 kcal.

No. Brushing your teeth does not break a fast. You spit the toothpaste out, and even a swallowed pea-sized amount would be under 1 kcal.

Unsweetened almond milk has about 15 kcal per 100 ml. A splash is grey for weight loss, blood sugar and gut rest and breaks an autophagy fast.

No. Salt, magnesium and unsweetened electrolyte mixes have no meaningful calories and are safe for every goal. Sugary sports drinks break a fast.

Vaping has 0 kcal, so it adds no calories to a fast. Nicotine is addictive and harmful, so this site never rates vaping as safe.

No. A vitamin D tablet or softgel has under 5 calories, so it keeps you fasted. It is absorbed better with a meal that contains fat.

Yes. A 30 g scoop of whey has about 120 calories and 24 g of protein. It breaks a fast for weight loss, autophagy and gut rest.

Yes. A 150 ml glass of red wine has about 125 kcal, mostly from the alcohol. It breaks a fast for weight loss, autophagy and gut rest.

Xylitol has about 10 kcal a teaspoon. That makes it a grey area for weight loss and blood sugar, and it breaks a strict autophagy fast.