With summer upon us there is still time to get to grips with losing unwanted weight – and the latest science points to my new best- selling Fast 800 diet as one of the most successful ways to shift fat fast and keep it off.Earlier this year, I shared the Fast 800 diet plan with Daily Mail readers, pulling together the most up-to-date research on the benefits of intermittent fasting – on which I based my original 5:2 diet – and introducing the option of a rapid weight-loss plan in which you eat 800 calories every day to kick-start your regimen and reap many other health benefits besides.The Fast 800, which incorporates the latest scientific studies, and feedback from numerous doctors and the general public, shot to the top of UK and international bestseller charts, and has already been embraced by thousands of people.There was an immediate demand for more Fast 800 low-calorie recipes, plus advice and information on this updated version of my simple yet flexible weight-loss approach, whi...