This is sound advice. Most people won't be able to keep at it long enough to make money at it. It's the same issue that we have with any sound advice. The devil is in the details.

For example, to shrink your fat cells, the easiest way to do so is to fast (withhold food) for a period of time to cause your body to switch to fat for energy instead of glucose.

However, we have to endure the change and stay consistent long enough for the process to take hold. That's always the complicated part. Most people will bounce to something else when discomfort or doubt sets in.

Anyone who can solve that issue for the average person will be an instant billionaire.