[johnward]

What about other factors? Sure thermodynamics says if you burn more calories then you take in you will lose weight but what about other factor like insulin that cause weight gain? Is eating 300 calories of sugar really the same as 300 calories of fat? I know from personal experience I can eat the same amount of calories on a keto(low carb high fat diet) and lose weight. Although eating fat makes it much easier to cut down on calories and accelerate weight loss even quicker because I'm simply not hungry like I usually am.