Does mct oil break a fast?
Breaks a clean fast
110-130 kcal per tbsp
No - breaks a clean fast. MCT oil is pure dietary fat. It may be used in keto-style routines, but it adds real calories.
Calories from oil still count, even if they are low carb and do not feel like food.
Oils provide about 9 kcal per gram; a tablespoon-sized serving is typically over 100 kcal.
Base tier: 25/100 for "Breaks a fast". Item adjustment: -7 points for calories, nutrient signal, product variability, and safety caution. Final Fast Score: 18/100.
Treat it as the opening item in your eating window or a modified fast, not a clean fast.
The Fast Score is an editorial estimate of clean-fast strictness, not medical advice. Goals vary — if you fast for glucose, appetite, or medical reasons, follow your clinician.