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Might not be that simple.
The body is quite good at keeping itself going, you can burn all sorts of stuff in the body to power respiration (production of energy). The brain can even use ketones.
Felling faint and unwell could be all sorts of things, cardio/vascular included. If you are worried then drop by your GP.
Not sure where to post this one…
I’ve had this problem maybe once a month where I start feeling faint, weak and unwell. And I think it’s related to what I’m eating/blood sugar?
I raced at Muddy Hell last night. Plenty of food before the race, 2 beers after, no food. Went home and treated myself to a Cornetto, but too late for a cooked meal.
Woke up this morning, 2 cups of tea, 1 cinnamon roll and a Lucozade sport.
I know I’ve not had a huge breakfast, but surely between the cinnamon roll and Lucozade sugar and electrolytes, that should be enough to keep me going?
The only other recurring theme factor is this normally happens during light exercise (walking/cycling) and when it is warm. I normally start sweating more. Not sure if is a cause or an effect.