Joan was given a smart watch and encouraged to stay active and keep track of how many steps she was doing.
The slimmer also used smart scales that connected to her phone to help her keep on top of her weight.
She used the Second Nature app, a tracking programme which helps dieter change unhealthy habits and lose weight.
Joan also regularly checked in with a dietician to ensure she was eating healthy foods.
While the plan was low in carbs, she was allowed to eat complex carbs such as brown rice, beans and pulses and vegetables.