Family of 4. 2 adults and 2 teenage dc.
Whole family usually have porridge or weetabix for breakfast on weekdays. There are no weight or health issues and food is plentiful in the house.
Weekend morning, adult1 has a toasted bagel for breakfast and is going to have a toasted muffin with eggs for lunch.
Dc1 has a toasted bagel for breakfast and is going to have a sandwich for lunch.
Dc2 has toast for breakfast and would also like a sandwich for lunch.
Adult1 says dc2 can't have a sandwich, as they've already had bread today, but can have a toasted muffin instead.
Adult2 thinks that bagels/bread/muffins are all more or less the same so it makes no difference and dc should have what they want for lunch.