Nonsense. McDonald's hamburgers don't taste any better than hamburgers cooked at home. They're just more convenient. And they don't contain MSG.
https://www.mcdonalds.com/ae/en-ae/your-right-to-know.3807.d...
https://www.mcdonalds.com/ae/en-ae/your-right-to-know.3807.d...
I don't think fast food restaurant necessarily create delicious superpalatable food.