Losing her father-in-law, not long after a close friend also died from cancer, made her aware of her own mortality. She decided to do something to improve her health.
For Sam, losing weight meant that she felt and looked healthier, happier and more self-confident. She could also take part in more family activities.
At 5ft (152cm) high and weighing 10.2 stone (65kg), Sam was overweight and at greater risk of developing chronic diseases such as type 2 diabetes.
She began a healthy weight-loss diet and regular exercise in January 2008. The diet was designed to help Sam lose weight gradually by eating smaller portions at meal times and choosing foods that kept her feeling fuller for longer.
“I had become used to eating large portions,” says Sam, a business development manager from Hemel Hempstead. “The diet plan got me used to eating smaller portions.”
After five months, Sam was transformed. She had lost 2.5 stone (15kg) and 10 inches (25cm) from her waist.
Sam Boyd before and after her weight-loss regime
She started out slowly, alternating running and walking over a 5km route. "At first, I'd do a minute of running and then walk for a minute," she says. "Gradually, I was walking less and running more until I could run the whole distance."
Within four months of starting, Sam was running three to four times a week. She entered several short distance runs (5k and 10k) before attempting the half marathon of 21km (13 miles).
“I feel so much better now and I’ve got loads more energy,” she says. Before she lost weight, she would have struggled to make it to the end of the road without running out of breath.
Sam says losing weight has really boosted her self-esteem. “I’ve dropped from a size 12/14 to a 6/8,” she says. “It’s a great feeling to be able to go into a clothes shop and pick up a size eight knowing it will fit.”
'Here to stay'
To stay motivated to exercise, Sam regularly takes part in running events, from 5k and charity runs, such as Cancer Research UK's Race for life, to half marathons, with her husband and daughter.
“I used to get out of breath walking up the stairs,” she says. “I never imagined myself doing a half marathon.”
Sam remembers the effort she put into getting back into shape. This memory is enough to prevent her from falling back into old habits. “I kept a diary during my weight-loss programme and I’ve got lots of photos of me before I lost the weight,” she says.
“They remind me of how I felt before and my initial motivation to turn things around. I think about how I looked and how unhealthy I felt, and I don’t want to go back to that.”