> > The other way is to watch the scale.  If you are loosing weight then
> > you are in ketosis.
>
> This is false.  You can be in ketosis without losing weight and
> you can lose weight without being in ketosis.

It is true that you can be in ketosis without losing weight, the statement
above only claims that ketosis is a sure sign of fat burning.

Ketones are the byproducts of fat burning, and people who eat high amounts
of dietary fat are often in 'ketosis' for that reason.

And it is also true that you can lose water and muscle mass, and thereby
decrease your weight without burning fat and producing ketones.  But it is
a bad idea.  You want to burn fat, and when you do you are going to
produce ketones.  The only debate is, how far into ketosis is it desirable
to get.