I drink coffee, decaff or regular a few times a day and it has not slowed me down. I also use heavy or light cream, depending on where i get my coffee/what i have in my fridge. No problem for me. its great before bed for me too (decaf), to fill me up when i want something sweet (my problem is NIGHT EATING), so its how i do myself less harm at night when i want to just graze! haha.