What is contained within fastfood hamburgers that make them so unhealthy and cause people to get fat?

Ped: What is contained within fastfood hamburgers that make them so unhealthy and cause people to get fat?
What is contained within fastfood hamburgers that make them so unhealthy and cause people to get fat? I already know that most of them are loaded with fat and saturated fat, but do they also contain certain chemicals or hormones that fatten people?

Answers and Views:

Answer by Kim T
No, it’s just the fat.

Answer by ej
They contain artificial flavors, smells, colorants,a nd preservatives. They aren’t really food, as is not any processed food. Your body treats them differently due to their complex chemical nature. Plus, they’re high in sodium, saturated and oxidized fat, and god knows what else as fillers and binders.

Answer by TEE N
starchy carbs, empty calories, trans fat.