[billjings]

Metabolism is a minor factor compared to calories in vs. calories out?

You are aware that one of the variables in that equation is intimately tied up with metabolism, aren't you?

[spudlyo]

Of course. Most dieters don't have access to a ventilated hood indirect colorimeter, so they have to rely on a method for estimating their BMR.

What I'm saying is that the difference between their measured BMR and estimated BMR (using either Harris-Benedict, WHO, or Schofield equations) is a minor factor.

[billjings]

I'm saying that I believe that diet has a real effect on metabolism. Not basal metabolism, but on the ability to maintain a given activity level. If you try and restrict your calorie intake, you will be less likely to go on a run, take a walk - etc. This is why Harris-Benedict may not be a good tool to manage long term weight loss, even though it is a useful predictive tool.