What Happens When You Eat Old Eggs. As an egg ages, it loses water out of the shell, so it becomes less dense. Older eggs have larger air cells, so they float.

Eggs are a good source of protein and contains vitamin a, d, e, b12, riboflavin and folate and minerals such as iodine, iron, calcium, zinc and selenium. Advertisement a group of bacteria, salmonella , is often responsible for food poisoning cases in the united states, according to the fda. A rotten egg will make you very sick.