Tomorrow I'm going to overdose on fructose.
Perhaps the speaker is afraid of being attacked by six doctors?
tomar means to take
yes that's right :)
Isn't tomar sometimes used to describe eating or drinking something?
More like to drink.
You use tomar for drinks and medicine in most cases.
I'd say tomar is mostly for anything you don't have to chew (eg. a drink, but also a pill).
in spain it's normal to say "mañana me voy a comer seis manzanas", right? to me it sounds better given that it's a fixed number
Yes, many times 'comer' becomes reflexive if a direct object is stated.
I looked up comerse in a dictionary and it seems to suggest 'eating all of one's own food'. Is that what you mean by eating all six apples? As opposed to just eating apples then use comer??
Really, both forms are valid. The reflexive form just puts some emphasis on the direct object, but that is all.
...and gives some informal emphasis: I'm gonna eat me some apples.
Wait, I thought that comer could mean "to eat" and the a wasn't necessary?