John MacDonald was rushed to hospital after his first weigh-in with a suspected heart attack but he turned his life around with 17st weight loss
When football fan John Macdonald was warned by his doctor that he wouldn’t live to see his 30th birthday he got the wake-up call he needed. The stark deadline was just a few years away and despite only being in his 20s, at almost 28st he already had prediabetes, sleep apnoea and high blood pressure.
But the warning was the kick he needed to transform his life and last month he marked his big birthday with the friends who made it possible after he lost 16st 12lbs (107kg) at Slimming World. John joined his local group in 2023 weighing nearly 28st, after his visit to the doctor – but it was not all plain sailing and in fact it almost ended before it began.
His weight loss journey began with a shock rush to hospital after he collapsed with what he thought was a heart attack at his first weigh-in at the group. But he said the terrifying experience became the spur he needed for his life-changing transformation.
Now weighing 10st 13lbs, John thanks his group for the support, structure and shared expertise that helped him achieve his “impossible” goal.
John said: “Being told I might not make my 30th birthday if I didn’t lose weight was the wake-up call I needed. Everything changed in that moment – all I could think about was my family, especially my mum who I live with, and everything I’d miss.”
At his first Slimming World session at Carrina McGovern’s group in Easterhouse, Glasgow, a panic attack left him in Glasgow Royal Infirmary. He said: “As I stepped on the scales I felt sick, my chest tightened and I collapsed – I thought I was having a heart attack.
“Kind members drove me to A&E. Looking back it was anxiety, made worse by barely eating in the lead-up to joining. I’d built up such a fear of seeing the number on the scales. Facing the challenge ahead hit me all at once.”
Despite his embarrassment he returned to the group the following week, marking the start of John’s long-term success. While nervous of what people would think of him, he soon found everyone was just relieved he was well.
John said it wasn’t all straightforward explaining: “I’ve had ups and downs, but now I understand how to manage it. I trust the plan and I trust myself. My life has been completely transformed. I’ve gone from a 52in waist to a 31in waist and can now wear the designer clothes I’ve always longed to.”
John said his life was completely different now and while he once relied takeaways spending “£30 most nights ordering enough for four” he now “steers clear of junk food and takeaways”, instead eating a lot more vegetables.
He said: “Carrina suggested I start planning my meals and I’ve enjoyed trying new recipes from the Slimming World app. I’d never really cooked anything before and now I love being in the kitchen making meals from scratch – Slimming World’s Cajun chicken pasta is my go-to.
“Carrina helped me focus on small changes that really add up. I swapped two litres of sugary fizzy drinks and four sugary teas a day for low-calorie squash and sugar-free hot drinks.”
Losing the weight along with the changes he has made have had huge impact on John’s health and day-to-day life. He said: “I’ve gone from doing no activity to gradually starting to walk to the local shops. It’s a 15-minute walk but it took me an hour. I slowly built up my fitness until that walk took me five minutes. Now I walk everywhere and I love it. My sleep apnoea has gone, my breathing’s better and I’ve got so much energy.”
Then last month, John hit the milestone the doctor told him he wouldn’t reach without change, celebrating his 30th birthday surrounded by the people who supported him. He said: “To celebrate turning 30 at my Slimming World group meant everything. A few years ago, I didn’t think I’d get here. This whole experience has completely changed my life. I’ve gone from being told I might die young to feeling healthy, confident and excited for the future.”
John’s Slimming World Consultant Carrina said: “John’s achievement is extraordinary and it’s a testament to his determination and willingness to lean into the support around him. We know men can sometimes feel unsure about joining a Slimming World group, yet John’s success shows exactly what’s possible.
“Our groups are welcoming, supportive spaces where everyone can succeed. I’m so proud of John – he kept going – even when it felt tough. That’s what made the difference.”
Laura Holloway, from Slimming World’s Nutrition, Research and Scientific Affairs team, said John’s journey reflected the proven benefits of group-based weight management. She said: “Our groups make a real difference to long-term weight loss. The accountability, shared ideas and practical strategies all help members like John create lasting habits and achieve truly life-changing results.”
This Men’s Health Week, which starts on Monday, men are being encouraged to prioritise their wellbeing. John, who has maintained his weight loss for over two years, said he hopes his journey will inspire others.
He said: “I was terrified walking through the door that first time, but it’s the best decision I’ve ever made. I didn’t think in the beginning I’d ever get this far. If you’re thinking about it – just take that first step. It could change your life like it changed mine.”
John’s success story features in the current issue of Slimming World Magazine. For details of how to join your local Slimming World group or sign up online visit slimmingworld.co.uk or call 0344 897 8000.
John MacDonald
- Start weight: 27st 11lbs (176.4kg)
- Weight at group finals 10st 13lbs (69.4kg)
- Height: 5ft 6in (168cm)
- Weight lost: 16st 12lbs (107kg) in one year and five months
John’s day on a plate
Before
- Breakfast: Sausage and tattie scone (square sausage with a triangular, flat potato scone in a morning roll with brown sauce) from the van near work. Tea with two sugars
- Lunch: Cheesy chips and curry sauce from chip van, two or three chocolate bars. Full sugar cola
- Dinner: Indian takeaway. Full sugar cola
- Snacks: Tube of BBQ Pringles, cakes, crisps. Coffee and tea with sugar
After
- Breakfast: Weetabix, fat free natural yoghurt with banana. Tea with sweetener
- Lunch: Chicken salad bowl from local cafe. Water or low-calorie fruit squash
- Dinner: Slimming World’s Cajun chicken pasta with salad or vegetables or Slimming World kebab in a wholemeal pitta bread with lettuce, onion, tomatoes and gherkins. Diet cola or water
- Snacks: Fruit, two high fibre snack bars, low fat yoghurts. Coffee or tea with no sugar or sweeteners




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