What is the main nutritional concern associated with feeding seagulls bread?

Answer

It offers very little nutritional value, acting as empty calories

Bread is widely considered detrimental because it offers very little nutritional value, essentially providing empty calories and displacing the nutrient-dense food the bird needs, potentially leading to deficiencies.

What is the main nutritional concern associated with feeding seagulls bread?
fooddietbirdanimalseagull