Lots of people love coffee, but you really shouldn’t be drinking it on an empty stomach, first thing in the morning. Registered Dietician Carlyn Rosenblum says for women, drinking coffee increases the stress hormone cortisol, which can negatively impact ovulation, weight, and hormone balance. Cortisol helps regulate energy and makes you feel alert, but getting too much of it in the morning ruins the hormone’s production and “shifts the timing of the cycle” throughout the rest of the day. This means you could end up feeling very away in the late evening.
She also says that drinking coffee first thing in the morning can also negatively affect the gut microbiome as it stimulates acid production in the stomach. So when can you drink it? Rosenblum advises pouring yourself a cup after breakfast, between 9:30 a.m. and noon, when cortisol levels are typically low.