Teenager Lauren Clarke was only about seven or eight when her mum Michelle became concerned about what appeared to be some "stubborn puppy weight".
It was a mystery. "Lauren had a healthy diet and was exercising regularly," she recalls.
Suspecting that it might be linked to an under-active thyroid problem – the condition runs in the family – Michelle brought her to the doctor.
However, two out of three tests for the condition were negative.
Although Lauren didn't like sweets much – she didn't even eat many at birthday parties – she did consume a lot of bread, pasta and other foods rich in carbohydrate, Michelle says.
She was also a very active child.
"She was doing dancing five days a week and was in football after school two days a week – she was getting a lot of exercise," says Michelle.
But as Michelle was to discover, the exercise was not compensating for the amount of carbohydrate-rich foods Lauren was eating. "We joined the Temple Street W82Go programme when she was about eight or nine, and she was assessed."
The team decided that Lauren was not overweight, but borderline, and that her big portions and the amount of carbohydrate in the diet were causing the weight gain.
"The main problem was that she tended to snack a lot on bread. She doesn't eat many sweets so it was the bread and the pasta that were doing it."
A look at Lauren's diet confirmed that her daughter was consuming a lot of carbohydrate, recalls Michelle.
"Lauren would have had toast or a big bowl of cereal for her breakfast.
"At school, she'd have a cheese sandwich made with white sliced bread for her 11 o'clock break, and another sandwich with cheese or chicken or ham for her big lunch at 12.30."
After classes finished, Lauren attended an after-school club where the children were given toast and soup.
She also invested in new – smaller – breakfast bowls.
"Lauren now eats a handful of breakfast cereal such as Weetabix and some fruit, like a banana or strawberries or blueberries.
"At school she now eats a wholemeal tuna sandwich at small break, and a snack-pot with noodles or pasta, and some fruit, eg banana or apple, at big break.