Balanced in favour of food allocation consumed (13)
I believe the answer is:
proportionate
'balanced' is the definition.
(similar in meaning)
'favour of food allocation consumed' is the wordplay.
'favour of food' becomes 'pro' (I can't justify this - if you can you should believe this answer much more).
'allocation' becomes 'portion' (portion is a kind of allocation).
'consumed' becomes 'ate' (to eat is to consume food).
'pro'+'portion'+'ate'='PROPORTIONATE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for proportionate that I've seen before include "in scale" , "each component should be this!" , "Corresponding in size or amount to something else" .)