What breaks a fast — your fast-safe list

Fasting for: Strict clean fast

Any measurable calorie counts. The only one of the five with a clean edge.

Allowed — 21 Nothing to burn, or far too little to matter for this goal.

Decaf coffee
Water
Sparkling water
Mineral water
Flavoured sparkling water
Diet soda
Pure stevia (liquid drops)
Monk fruit sweetener
Erythritol
Sugar-free syrup
Creatine monohydrate
Multivitamin tablet
Magnesium capsule
Melatonin tablet
Salt
Electrolyte powder (unsweetened)
Baking soda
Toothpaste
Mouthwash
Cigarette or vape
Lip balm

Think about it — 0 Either the studies disagree, or nobody has run one. The checker says which.

Nothing on this list lands here for strict clean fast — every item is either allowed or not.

Breaks it — 107 Enough energy, protein, sugar or gut activity to end this fast.

Black coffee
Espresso
Black tea
Green tea
Herbal tea
Matcha
Instant coffee
Cold brew
Chicory coffee
Heavy cream
Splash of cream
Half and half
Whole milk
Skim milk
Unsweetened almond milk
Oat milk
Soy milk
Coconut milk drink
Butter
MCT oil
Coconut oil
Bulletproof coffee
Sugar
Honey
Coffee creamer (powdered)
Cinnamon
Vanilla extract
Zero-sugar energy drink
Regular soda
Tonic water
Sugar-free squash / cordial
Kombucha
Stevia (packet)
Sucralose (packet)
Aspartame (packet)
Xylitol
Allulose
Agave syrup
Maple syrup
Brown sugar
BCAA powder
EAA powder
Collagen peptides
Whey protein
Plant protein powder
Gummy vitamins
Fish oil capsule
Vitamin D softgel
Pre-workout
Apple cider vinegar gummies
Psyllium husk
Greens powder
Electrolyte tablet
Bone broth
Stock cube (bouillon)
Miso soup
Pickle juice
Lemon juice
Lime juice
Orange juice
Apple juice
Coconut water
Sports drink
Vegetable juice
Milk (glass)
Iced tea (sweetened)
Smoothie
Vodka / gin / whisky
Dry red wine
Dry white wine
Light beer
Regular beer
Hard seltzer
Celery
Cucumber
Cherry tomato
Olives
Pickle
Sugar-free jelly
Almonds
Egg
Greek yoghurt
Apple
Banana
Avocado
Cheese
Beef jerky
Peanut butter
Dark chocolate
Rice cake
Chicken breast
Sugar-free gum
Regular chewing gum
Sugar-free mint
Tic Tac
Cough drop
Nicotine gum
Apple cider vinegar
Black pepper
Mustard
Hot sauce
Soy sauce
Nutritional yeast
Ketchup
Salsa
Lemon zest
Ginger

Servings are the ones people actually use — a splash, a teaspoon, one packet — from published USDA FoodData Central figures. Every verdict is computed from those numbers, or from a named mechanism they cannot show. None of them is typed by hand.

Medication is not on this sheet. A tablet carries no meaningful calories and does not break a fast; the question is whether the medicine needs food, and if it does, the food wins. Never skip, delay or split a dose to protect a fast. Fasting before blood work is stricter than any goal here — usually water only for 8 to 12 hours. Follow your lab's instructions.

getfasted.app/tools/does-it-break-a-fast — the full checker, with the reason behind every line. Not medical advice. Nothing on this sheet is medically reviewed; it cites its sources.