efficacy or effect
In reading I've come across a word 'efficacy' for the result that an edible brings to your body.
Peanut has hot efficacy.
In this case efficacy would be the wrong word to use and also, you are trying to use it in the wrong sense.
Efficacy is the the ability of a method (which we can ignore in this context) or of a medicine to achieve/produce an intended result. Therefore the food being talked about must have a medicinal effect. Turmeric would be a good example. As far as I am aware peanuts have no medicinal abilities.
So lets now do some substitutions and see if the sentence works
Turmeric has hot ability to produce the intended result.
I do not think you are trying to say that the Turmeric (Peanut) is sexy, spicy, exciting or warm. Therefore it would be wrong to use the word hot.
However I appreciate that in the Far East certain foods can be considered Hot (But not spicy). For example in Chinese traditional medicine terminology, (Sang Huo) Hot, (Han) cold, (Wen Xing), neither hot or cold and numerous other states which I will not list. I cannot be positive but I believe Peanut is Wen Xing.
efficacy noun; the ability, especially of a medicine or a method of achieving something, to produce the intended result:Cambridge English Dictionary
hot adjective sexy, spicy, exciting or warm Cambridge English Dictionary