All beings eat.
All races need to eat.
All the races that visit Earth eat plants.
They eat plant foods native to their own unique worlds.
They may be put into another form but are still pure.
Almost all other races of people and planetary species intake just what is needed for sustenance of the body and elimination is enough through the skin and breath.
They only eat what their bodies absorb.
So they don't have bladders or intestines.
They exhaust small amounts of waste through skin and breath, the same as we do. 
Earth humans eliminate waste largely in a rare way, through the bladder and bowels, which is strictly a planetary life characteristic.
Normally, beings eat just what they need to eat and have no need for bowels or bladder to exit waste in quantity. 
We were brought up on processed foods, now we are sick.
The other races don't eat processed foods.
They don't pay for food and don't have advertising either.
We make weapons instead of feeding all our people.
We already have a way to feed everybody.
But we don't.
Our leadership is maintaining human suffering.