I have recently started drinking a cup of coffee in the morning on an empty stomach about 2 hours before my first meal and noticed a big improvement in my mood, which seems to last all day. I don't feel the stimulant effects of the coffee from one cup, but I am just generally more happy, upbeat, and talkative throughout the day. I didn't notice this as much when I used to drink it on full stomach. I took a few days off this week and didn't feel depressed or anything, but was not as cheery as I am with coffee. Today I had a cup and the same positive mood came back. Is this a bad thing, like I'm lacking something without the coffee, or is it perfectly fine to have a cup a day to get these effects?