I can taste a difference in milk when its close to expiration, even though it doesn't smell bad. Expired milk can make you quite sick and I'm not poor, so I don't bother with milk passed the date.
Dairy is about the only thing I care about an expiration date on.
Most other dates are just about peak freshness, dry/canned goods do not actually expire if properly stored.
Canned goods are constantly leaching toxic compounds into the food as the plastic liners break down. This is especially true for high-acid foods like tomatoes. I would strongly recommend limiting your exposure to canned goods, especially if you have male children who are still developing. They ALL have plastic liners.
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