Comparing actions using verbs (she runs more than you) is different from comparing qualities or things.
Have a look:
Note that to compare actions (verb [+ object]), you use comparative words as follows:
|[verb] more than||[verbe] plus que|
|[verb] less than||[verbe] moins que|
|[verb] as much as||[verbe] autant que
Note that the comparing words never come before the verb:
you cannot say "Je plus mange que toi."
Sometimes, when the action includes verb + object (e.g. to play cards, to do the dishes), then the position of the comparing words can VARY:
it can be <verb> + <object> + plus/moins/autant que
or <verb> + plus/moins/autant + <object> + que
Whereas in English, you will need to use a subject pronoun after than (...than I (do), you (do), he/she (does)...), in French you will once again use the stress pronoun after que (... que moi, toi, lui/elle, nous, vous, eux/elles). You will also never repeat the verb with (do/am/have) afterwards.
Julien eats more than you do.
See also other Comparative structures:
Plus... plus..., moins... moins... = the more...the more..., the less...the less... (comparisons with phrases)
Better and better, worse and worse = de mieux en mieux, de pire en pire (comparisons)
De plus en plus and de moins en moins = more and more and less and less (comparisons with adjectives, adverbs, verbs)
De plus en plus de and de moins en moins de = more and more and less and less (comparisons of nouns)
Making comparisons with adjectives: plus... que, aussi... que, moins... que
Making comparisons with adverbs: plus... que, aussi... que, moins... que
Making comparisons with nouns: plus de... que, moins de... que, autant de... que
And for Superlative forms, see:
Le, la, les plus and le, la, les moins = the most and the least (superlatives of adjectives)
Meilleur, mieux, pire / plus mauvais, plus mal = better, best, worse and worst (irregular comparatives and superlatives)
Le plus and le moins = the most and the least (superlative of adverbs)