Point: you should expect any Lifestyle Coach, or anyone recommending an approach to your nutrition and fitness, to be able to explain how at a physiological level how their approach will bring about the desired change in health and body composition. It would not be unusual to ask for references supporting their explanation. If they can't, how can you be sure of the technique(s). You can always go for simple, but remember, "if it was simple, there would not be a weight/health problem right now."