I never singled out dairy fat (cream) as a bad component of milk, in fact fat is good and necessary to your metabolism. Being fat is the health problem.
Eating fat does not make you fat, eating sugar and starch does.
For a long time, the FDA or Dept of Agriculture had this recommended dietary pyramid, it had a low fat requirement and lots of carbs at the foundation. The government lied to us, and now Americans look like a bunch of hogs.
I eat dairy products regularly, but milk is not a staple in my diet.
I would probably make chowdah with a splash of milk, some heavy cream and maybe some sour cream. Definitely a stick of butter.
So if I consume 3,000 calories a day entirely from fat, and only expend 1,500 calories a day via metabolic processes and physical activity, I won't gain weight? And, if I eat 1,500 calories a day from only sugar and starch, but burn off 3,000 calories a day, I won't lose weight because all calories consumed came from carbs? Is that what you're claiming?
That's what it sounds like. If so, you need to rethink what you've written.