So funny that you would mention your LO believing that the yogurt was tainted! I had the exact same experience with my mom about 6 months ago. I didn't know then about food tasting different, or I would have handled it differently. She was still driving then, and had gone to a few different grocery stores and bought different yogurts and was CONVINCED that the yogurt was sour. I tried to appeal to her logic - how could all of the yogurt be spoiled? To no avail.

After I helped her clean out her fridge, I found no less than 5 different brands of peanut butter, all with only like one spoonful eaten. None were any good to her.

It's such a weird disease!