Dr Michael Mosley, creator of the Fast 800 and 5:2 diet, appeared on This Morning on ITV to talk about the controversial liquid diet technique and healthy ways people can lose weight quickly but safely.
His appearance on the popular morning show comes after reports emerged that cricketer Shane Warne had been on a liquid diet before suffering fatal heart attack on March 4.
The former doctor included how liquid diets can be harmful as well as offering healthy diet advice during the segment.
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The diet expert shared with presenters Phillip Schofield and Holly Willoughby the one type of food slimmers should be eating in high amounts for effective fat loss.
He explained: "I don't think exercise alone is going to help you lose weight but it improves your mood if nothing else.
"The data suggests if you combine it [diet] with exercise that's a great way [to lose weight].
"And one of the things you want to do, and this is the importance of protein - you need at least 50g of good quality protein a day - that preserves your muscle.
"The things you want to do when you lose weight is lose fat and not lose muscle and that was the danger of going on a really low calorie, low protein diet - tea, juicing - is that your body needs protein and if it's not getting it from your diet, it's getting it from your muscles.
"So you need decent protein and exercise and that really means doing press ups and squats," the expert said.
Lean proteins are lower in fat and calories, so they are great for someone looking to lose weight and preserve muscle mass.
There are many lean protein foods to consider; white-fleshed fish, frozen prawns, skinless white meat poultry, lean beef, pork loin, egg whites, low fat milk, plain Greek yoghurt, low fat cottage cheese, tofu, beans, peas and lentils.
