Lyle McDonald cliffs why we get fat

Cliffs

At a fundamental level, fat storage occurs when caloric intake exceeds caloric output. Now, I know that a lot of people claim that basic thermodynamics don’t hold for humans. Simply, they are wrong. Invariably, the studies used to support this position are based on a faulty data set: people under-report food intake
Net Change in Fat Stores = Fat Stored – Fat Burned
Carbs are rarely converted to fat and stored as such
Protein is basically never going to be converted to fat and stored as such
When you eat more protein, you burn more protein (and by extension, less carbs and less fat); eat less protein and you burn less protein (and by extension, more carbs and more fat)
Ingested dietary fat is primarily stored, eating more of it doesn’t impact on fat oxidation to a significant degree
Excess dietary fat is directly stored as fat
Excess dietary carbs increases carb oxidation, impairing fat oxidation; more of your daily fat intake is stored as fat
Excess dietary protein increases protein oxidation, impairing fat oxidation; more of your daily fat intake is stored as fat
When dietary fat is below about 10% of total daily calories, the body ramps up de novo lipogenesis (creation of fat from carbs). So you still get fat.