― Pop these in the freezer for a low fat treat, swap for ice cream at only 100 calories per pot. My favourite way to have a dessert without overeating and in the heat we've had for the last few days here in London, this has been the best! Once the yoghurt is frozen, it can be a little difficult to eat so you have to take your time and savour it bit by bit instead of guzzling it down like half a tub of Ben & Jerry's. Easy, cheap, low fat and low calorie. 33p for 4 at Tesco. .