McDonald’s food has no flavor. It has all been destroyed during their manufacturing and preservation process. What you’re “tasting” is actually scientifically engineered odors that are added to the food with chemicals. When the food gets old, or cold, those smells dissipate and you taste what it actually tastes like. This whole process was outlined in detail in the book Fast Food Nation back in the late 90’s or early 00’s. I imagine that the issue has only gotten worse since then through ever present cost cutting strategies. McDonald’s is absolutely disgusting, and nobody should eat there. It barely qualifies as food.