Tom explained: "I managed to lose four stone within a year, bringing my weight down to 89.3kg (14 stone). As someone who loves his food, Tom said: "The idea of fasting seemed as appealing as cutting out my own tongue. However, there are several tools that can help, one of which is the Simple app, which I have tested before." To lose weight, a person needs to consume fewer calories than they burn, so the body uses stored fat for energy instead of food intake. "That's how you lose weight and keep it off.