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Over time the seeds could cause an issue with his intestines. As people age little pockets form in the intestines and seeds or other non digestible pieces of food can get stuck in them and cause irritation. This is called diverticulitis and can be painful. This is generally in older people. Not everyone gets it but something to keep in mind.
Vitamin or mineral toxicity is a guarantee. Seeds could cause digestive issues. Spikes blood sugar (fibre isn’t some sort of god) specific compounds that we don’t know about could potentially build up in excess