Been toying with this idea for a while now. I lead a rather active lifestyle, exercising about 4-5 days a week, sometimes 2-3 sessions a day including gym, on the bike and running. But lately I've really struggled with fatigue. Like just full on fatigue, only have the energy to go to work and do the necessary chores. I've been told about underfueling, but how do you know that's it?
Appreciate any advise or anyone who's been through something like this.