[gnaritas]

You don't have to be able to define balance, to point out unbalanced, and any diet largely cutting out one of the 3 is unbalanced.

> I've eaten a low carb, high fat, moderate protein diet for about 4 years. All my blood markers (cholesterol, triglycerides, etc) have improved significantly over that time period.

That's like saying I've been smoking for 4 years and I don't have cancer so smoking must not have any long term adverse effects; bad logic and insufficient sample size.

[dragonwriter]

> You don't have to be able to define balance, to point out unbalanced

Yes, you actually have to be able to define what range of mixes counts as "balanced" before you can label anything as outside of that range. (And, moreover, if you want to credibly assign significance to that label, you probably also need to be able to provide evidence that your definition of "balanced" corresponds to a range outside of which there are serious negative consequences.)

[gnaritas]

> Yes, you actually have to be able to define what range of mixes counts as "balanced" before you can label anything as outside of that range.

No, you don't; for example, eliminating one is not balanced now matter what numbers you assign to balance.