You can actually adjust what the items you consume do, so you can for example, make a plant leaf give you +5 energy shot if eaten.
You need the ingredients.txt file in the data folder, and behind an ingredient you have to add stuff like (++++energy) which makes it +5 energy same with health, it's +hp, and as far as I know you can put up to 5 '+' characters before an attribute. If you want more then one attribute on the same item, you have to seperate them within the ( )'s with a space.
The attributes I know of are these:
hp - increases hp
maxhp - fills hp
energy - increases energy shot damage
regen - regeneration
speed - increases speed
defense - increases defense
invincible - gives you a certain time of invincibility, up to 25 seconds I think(with 5 +'s)
petpower - increases your pet's damage
allstatus - this one needs a - in fromt of it, which makes it cure all statusses, or with a + give them all
poison - adds or removes poison depending on the + or -
blind - adds or removes blindness
trip - the trippy effect, more + characters increases the time I think
li - makes Li eat the item, though as far as I know you just see Li eating it and it has no other benefits, might be an increment to his damage, but I'm not sure.