Eating during exercise - what does 'science' say?

Hi guys,

I'm not a professional, so please bear with me here.

Taking a small meal of 350 kcal or a Whey-shake during my weightlifting does provide me with an extra boost (not sure if it's placebo or real).

I tried to Google without success: when doing this, what "happens" to my body? Is it good/bad for muscle recovery, weightloss etc. ?

I received pretty much all answers of good and bad while doing my own search - so I want to know that the studies say.

Thanks! :)

from Bodybuilding.com Forums - Nutrition https://bbcom.me/2FZLENE