IF with a physically demanding job

Does anyone do IF while having a physically demanding job? Construction, labor, firefighters, etc. I'm a firefighter, I follow the 16:8 protocol so I generally don't eat until 12ish when we eat at work. And at nights I won't eat from say 8 or 10p til 12ish the next day.My concern is if we catch a fire or go training between 8p til 12p, I don't want to be a dead slug or pass out. I had a similiar experience last yr (before I started IF) where we had a fire at 10AM and I was dead tired after 5 minutes of work. I didn't eat nor drink anything besides tea that morning but I'm more inclined to think I was dehydrated as opposed to malnourished since I became nauseous and weak. I keep myself properly hydrated now but I don't want to ever be in that situation again. via /r/intermittentfasting https://ift.tt/2RrauHW https://ift.tt/eA8V8J