Our decisions are guided by our subconscious not our conscious brain.
To make someone taking a decision differently, it is necessary to change his subconscious brain, not his “logical” brain
The potatoes example :
If someone do not like potatoes it is not because his body do not like, it is because when he tasted potatoes for the first time something bad was happenning (very bad news for example, bad situation, etc…) – then this preference is stored as a “knowledge” and will maybe never change.
So to make him like potatoes again it is possible under hypnosis to make him feel very weel , then make him eating some little potatoes. repeat 10 times. Then he will start like potatoes because he will remember to feel well while eating potatoes. So he may think it is eating potatoes wich make him feeling well. So he will think potatoes are good for him. Later if someone ask him to try , he may try and then he will remember what he learned 10 times, so he will fell well, then he will change his “knowledge” about potatoes.
A strong method to give subconscious “preferences” :
if we want to change an opinion about something , then stronger stimuli is sex.
If the subject is very confident with the hypnotiser, it is possible to make him feeling an orgasm “on order”.
First it is necessary to make him confortable feeling orgasms.
Then it is possible to associate feeling an orgasm with some phrase/words.
The word can be the name of someone, a company name, anything simple.
Later at a conscious level he will not remember the orgasm, but when he will think/hear the words he will think it is a very very good thing at subconscious level, and will act in consequence