Can you drink coffee during intermittent fasting?
Black coffee fits perfectly well within intermittent fasting and, certainly with moderate use, is not bad for your heart. If you add a significant amount of milk or sugar, that counts as a calorie intake and breaks the fasting window.
Coffee fits perfectly within intermittent fasting. In a recommended dietary pattern that combines time-restricted eating with a Mediterranean diet, water, coffee and tea are explicitly mentioned as suitable drinks during the fasting window. That applies to tea as well.
Moderate coffee consumption, up to roughly three to five cups per day, does not come at the expense of your health. Multiple studies actually link this level of coffee intake to a lower risk of heart problems and stroke, compared with drinking no coffee at all. Coffee contains antioxidants and appears to have a mild anti-inflammatory effect.
Coffee does have no calories when you drink it black. If you add milk, cream or sugar, that is strictly speaking no longer fasting, because those additions activate digestion and insulin production. Whether that negates the benefits of intermittent fasting depends on how much you add, but as a straightforward rule of thumb: black coffee fits within the fasting window, coffee with a substantial number of calories does not.
A word of caution: intermittent fasting is not suitable for everyone. If you are pregnant, breastfeeding, still growing, or using insulin or other medication for diabetes, fasting protocols may carry risks. In those cases, discuss it with your doctor first.
Claims are based on three PMIDs (40504596, 37712135, 32943166), observational and associative in nature. Whether coffee disrupts the fasting effects of intermittent fasting is not directly examined in the available studies. The recommendation to allow coffee within time-restricted eating comes from a single source (PMID 32943166).
Can you drink coffee with milk while fasting?
Milk in coffee breaks the fast: it stimulates insulin secretion and counts as food intake. If you want to keep the fasting period intact, drink your coffee black.
Does coffee help protect against type 2 diabetes?
Three to five cups of coffee per day are consistently associated with a lower risk of type 2 diabetes, and genetically informed analyses make a causal relationship plausible. Opt preferably for filtered coffee without sugar, and stay below four cups per day.
Does the fasting-mimicking diet such as Prolon actually work?
For healthy people with risk factors such as elevated blood pressure or blood lipids, there are indications that the diet offers short-term benefits, but the long-term effects and applications in diseases such as diabetes or cancer have not yet been proven in humans.
Does a fasting-mimicking diet work better than simply eating less?
A fasting-mimicking diet has promising effects on several health markers, but whether it works better than simply eating less has not yet been demonstrated. If you want to try it, be aware that independent long-term data are still lacking and that the costs of commercial packages are a real consideration.
What does intermittent fasting do to your insulin sensitivity?
Intermittent fasting improves insulin sensitivity in most people, but be aware of possible muscle loss and hormonal effects, especially if you combine it with intensive exercise.
Does intermittent fasting help your gut health?
For healthy people and people with metabolic syndrome there is reasonably consistent evidence that intermittent fasting has a beneficial effect on gut bacteria and inflammation markers. If you have a chronic bowel disease, discuss fasting with your doctor first, as evidence in that group is still lacking.