Some foods that are sour are lemons, grapes, and tamarind. Some types of oranges and some melon can also have a sour taste to them.
damaged taste buds, severe head trauma, brain damage or a birth defect.
I have never noticed a sour taste in my dairy foods. You are possibly letting it get over date.
Lactic acid produced by fermentation.
Probably , sour .
Lime
The front taste buds taste salty and sweet foods. The sides of your tongue taste sour foods. The taste buds on the back of your tongue taste bitter foods.
Well, the whole thing is very complicated. The asorbic acid in sour, compliments the falic acid in other sour foods. It may seem more sour to you if you taste sour on sour, but it is just your taste buds reacting to two different chemicals. Both chemicals combined make it very easy to be tasted, and sometimes disliked. When you taste sour on salty it's harder to taste. One ingredient in salt, called cottonseed extract, mainly counteracts most asorbic and falic acids. So, in most salty foods it's harder to taste sour things.
I've heard that diet of the individual can alter taste.
Miracle Fruit!
The taste buds are located on the upper surface of the tongue. The taste buds are able to taste foods that are bitter, salty, sweet and sour.
Lactic acid produced by fermentation.