https://thebloodsugardiet.com/ – A very low calorie diet using real foods and a Mediterranean style eating plan. Good for weight loss and under supervision if you have diabetes.
https://www.diabetes.co.uk/lowcarb/ A program by Diabetes.co.uk
http://www.nhs.uk/Livewell/weight-loss-guide/Pages/losing-weight-getting-started.aspx Official NHS dietary advice.