I found on the web this it’s called
James Duncan diet
It’s Not from a company it’s all free and it’s the only one which has foods I like to eat and isn’t complicated in terms of measuring etc plus they talk about it being for nhs and operations
It sounds a sensible plan to me?
http://www.jaduncan.com/2006/04/how-i-lost-stone-in-week.html?m=1
Might be worth a look?