I've experienced this as I've ramped up my morning workouts. I often don't get hungry until lunch.

I find that, while exercise reduces my own appetite temporarily, it ramps it up later.

I’m not sure what’s behind this, could be endorphins, adrenaline, or something else entirely-- but I wonder if it’s related to that “runner’s high”. The first time I ran a 20-miler on a Sunday, about 3 hours of steady, low-key cardio, I went through an entire box of pasta afterwards and still felt like I needed more food right after. Now, after doing it 20+ times, I don’t even feel extra hunger kick in after the workout.

On days when I wake up and do something intense, like 4x1K repeats or 2x2-mile threshold sets, I feel electric afterwards, but at at the same time thinking about food makes me slightly nauseous. I’m not even close to hungry for hours, which throws off my eating for the rest of the day.

But then there’s carryover calorie deficit. Let's say the next day I wake up for an easy day with a 5-8 miler, I’m sold on breakfast right afterwards, and I can usually eat any amount that's in front of me.

For intense morning training I always had a small bowl of oatmeal (straight, non salted or sugared) and milk half an hour before, and two very strong coffees right after (before sauna cooldown), then some lean meat, chicken filets or steak as lunch.

When you are in peak form, you actually feel the effects of nutrients in your body very intensely.

> the study examined eight males and six females

Last sentence I read of that article