How long after food before you can exercise?

Up to you really. I find weetabix quite easy to digest so can do something reasonably fast paced about 30-45 mins afterwards. If you are going to be working really hard, I'd wait at least 1hr30, pref. 2hours before starting though.

It depends on the person, I think. I could happily run 5 miles or so 15 minutes after eating a roast dinner. I'd leave it half hour if I were you.

Crikey ? I need an hour and a half or two hours.

Me too or I get hideous stitch! That's why exercising in the morning is not good for me as I'd have to get up really early to eat!

I exercise before I eat in the mornings. Can happily do anything up to about 10k without food.

I suprised myself to be honest - felt sluggish until I started but had loads of energy. I was also ok with up to 10k on no food too. This was way back when I could run by the way.

With breakfast, as it's such a light meal, I quite happily get on my bike almost immediately afterwards, but I'm guessing that's not as strenuous as what you're talking about. However I do regularly swim 40 lengths only half an hour after breakfast, with no ill effects.

The most strenuous exercise class I do is in the afternoon, so I sometimes need to eat a banana or cereal bar immediately before to keep my blood sugar stable (I have type 1 diabetes) and have never suffered any ill effects.

If I've eaten anything more substantial then walking is about the only thing I can manage within an hour or two. I think it depends on whether the exercise involves any pressure on my stomach: as long as I'm not doing scrunchies then eating weetabix wouldn't stop me doing much!