If stop eating a food for a while a year+can you reintroduce it in your diet sans negative reaction?

You should study some books about nutrition. Every food is different, and every person is different. Europeans stop taking milk when they are children, and the body stops producing the enzyme to digest milk, so Europeans as a rule can't consume milk at all. Americans think milk is important so they continue to consume it, so their bodies continue to produce the enzyme. Various people have various reactions to wheat and other foods. Some can build tolerance and some can't.

TIP: Very few people understand French words unless they have been around long enough to become English words. Sans means without, so say without. Nobody appreciates you using funny words to appear intellectual.