When I need to concentrate, I drink whipped cream and coffee. 3 dl of cream and a cup of coffee and I'm down for 8h of hard math problems. People say that it is

When I need to concentrate, I drink whipped cream and coffee. 3 dl of cream and a cup of coffee and I'm down for 8h of hard math problems. People say that it is unhealthy, but it is not. The whipped cream is instead of other food sources, if you drink it in addition to a regular lunch, then that would probably make you fat.