At her heaviest, Jessica Clark weighed 95 kilograms (inset). The 20-year-old from the Gold Coast was teased at school about her weight, and had trouble managing her portion sizes. A few years ago she decided to make a change, and shed close to half her body weight (left, right). Through high-intensity training a high-protein diet, Miss Clark lost 40 kilograms and today, as well as competing in body building competitions, runs her own personal training business.

At just sixteen years old, Raegan Katene from New Zealand, tipped the scales at 104 kilograms (left). However, it wasn't until the teenager was told after a medical exam that she was morbidly obese (at the time she weighed 104.3 kilograms), that Katene knew something had to change, and that she needed to lose weight. Here, FEMAIL meets Katene, after she lost 36 kilograms throughout 2015 (right), and finds out why she credits her incredible weight loss to healthy eating and exercise.

Katy Gill, 34, from Liverpool, snacked on cakes and biscuits to help her get through night shifts as a 999 operator. But she decided to overhaul her diet after her daughter Molly, 10, complained that - at 17st 7lb (left, with daughter Olivia in 2011) - her mum was too big to hug . Now at 10st 7lb Katy has had a glamorous makeover and enjoys trying out different looks and showcasing her transformation on Facebook to inspire other slimmers.

Karl Tucker, 25, from Banbury, Oxfordshire, was fitted with a colostomy bag after the inflammatory bowel disease caused his weight to plummet. He shared the post-workout selfies from January to March on Facebook, showing how his body got stronger, healthier and more defined. Karl explained: 'I wanted to show people that you can achieve anything.' The post has since been liked more than 3,200 times and many have hailed him an 'inspiration'.

Phoebe Jackson-Edwards, 24, from London, took a BioScore test which calculates your body's true age. Phoebe, who hasn't exercised in eight years, tackled a series of workout tests including weighted lunges (left), pulling herself up using TRX bands (top centre), planking for 60 seconds (top right), rowing 500m (bottom left) and jumping in and out of a hexagon (bottom centre) as well as metabolic and lifestyle tests. She was horrified to learn that she has the same profile as a 34-year-old.

Scientists at Brescia University College warn eight in 10 school children regularly consume highly-caffeinated drinks, while 11 per cent drink more than one energy drink, soda or coffee a day. While caffeine is generally safe for adults to take in moderation, it is not deemed safe for children. Too much can prevent young people from getting the sleep and nutrients they need for healthy physical development. But what is the recommended intake? In the UK, the Food Standards Agency advises children should only consume caffeine in moderation while pregnant and breastfeeding women should not have more than 200mg of caffeine during the day - roughly two mugs of instant coffee, or one filter coffee. The Mayo Clinic, in Michigan, advises adults limit themselves to no more than 400mg of caffeine a day - the equivalent of four cups of coffee or two energy drinks. From left to right, a regular can of Pepsi contains 38mg, while Dr Pepper and Diet Coke contain 42mg. Meanwhile Coca Cola has 32mg, while a regular americano or single shot espresso contains around 77mg of the stimulant and a can of Red Bull 80mg - however other energy drinks can contain as much as 500mg.

Marnie Riches began to notice that her hearing was deteriorating six months after moving into her new property in Hale, Greater Manchester. The mother-of-two learned that she was suffering an allergic reaction to dust mite faeces which caused her ear canals to collapse - and needed surgery to treat.

The photos, taken by Temecula, California-based birth photographer and doula Robin Baker, shows a couple together in a bath welcoming twin boys after the birth progressed so quickly that the birthing team didn't have time to arrive. One of the images in the series, showing the second baby arriving en caul, was a winner in the International Association of Professional Birth Photographers' 2016 Image of the Year Competition.

Tina Fey oozed glamour at the Oscars awards ceremony when she flaunted her toned shoulders. But the 45-year-old actress and comedian says she only works out 'infrequently', adding: 'While it would be great to work out an hour a day, there is something inherently sort of selfish about it.'

Having watched her mother battle breast cancer and then ovarian cancer, only to learn that she, too, had inherited the faulty gene that dramatically increases the risk of both, Paula Macrae, 36, from Edinburgh decided she would not have children. But then she found out about pre-implantation genetic diagnosis, which helps couples with a known inherited condition in their family to avoid passing it on to their children. Pictured with son Owen, left, and husband Andy, right.

WARNING GRAPHIC CONTENT: Joel Greaves, three, from Leicester, suffered from Stevens Johnson Syndrome (SJS) - a life-threatening allergic reaction to his triggered by his croup medicine. He developed a rash which doctors initially believed was chicken pox, before the skin over his entire body began blistering and burning and his eyes swelled shut (left). He was rushed to intensive care and put on a ventilator when doctors realised it was SJS - and his mother Tammy, 32 (right) was given the awful news he may not survive. Thankfully, he battled to recover and after nine weeks in hospital (middle), has now returned home and has learned to walk, talk and eat again. Ms Greaves said: 'Joel was unrecognisable as his body was so swollen and he had to undergo an eight hour operation to remove all the dead skin. I couldn't be more thankful to all the hospital staff that saved Joel's life.'

The This Morning host broke down while interviewing the parents of 15-year-old Matthew Garnett (inset), from South London, who has spent six months in a secure psychiatric unit, which is only designed as a short term option. Robin and Isabelle (right) launched an online petition to help their son that has been backed by more 180,000 people. Mother-of-three Holly wiped away the tears as she heard about their plight to move their son from the 'prison-like' facility to one where he will receive proper treatment for his condition.

The BBC presenter discovered she had breast cancer in July last year. Wiping away tears, the 47-year-old said she was looking forward to having a cuddle with her sons to celebrate. The former Newsnight and BBC Radio 5 Live presenter said: 'I'm home and I'm happy and I can't stop crying which is mad. 'When it was over, the drugs had stopped going into me through the IV drip ... I think I felt in shock, I couldn't really speak. Which is not like me, as you'll have gathered. Now I just want to see my boys after school, and have a cuddle and have a celebratory tea and get on with the rest of my life.' The clip then cuts to her sons presenting her with a bouquet of flowers and chorusing 'Happy end of chemo mummy. No more chemo!', to which she squeals and replies 'Gosh, thank you'. Ms Derbyshire shared the video with her 50,000-plus followers on Twitter accompanied by the words: 'GOODBYE CHEMO!!!'.

This is the fourth surgery that Judy Cloud, 49, of Indiana had to undergo to remove her skin cancer. The painfully invasive surgery left her unable to eat solid food or move at all for two weeks. Cloud spent a lot of time in the sun as a child and in her 20s, visited tanning beds about four times a year and despite her family having a history of skin cancer, she thought she was immune.

Women whose babies develop fatal defects in the early stages of pregnancy will be given advice on going ahead with the birth so the NHS can harvest their organs, The Mail on Sunday can reveal. Most expectant mothers opt for termination after being told the devastating news their child has no chance of survival once born. But now, amid a chronic shortage of donated organs, mums will be 'supported' to have the baby at nine months so that the child's vital organs can be taken for transplant.

EXCLUSIVE: Sophie Morris, 37, from Cambridgshire, initially put her sickness and tiredness down to being pregnant with Fynn, now two. She was also working as a nursery nurse as well as having children Cian, eight, and Rhea, six (pictured right, with Fynn). She visited her GP after the symptoms intensified, affecting her balance and distorting her vision but was told it was likely from being a new mother again. She was told to buy a new pillow to ease her neck pain and ask her partner Gavin Smythers (left with Ms Morris, holding Cian) for more help. It was only following a visit to the opticians that it was clear something was pressing on her eyes. She went for scans at hospital and underwent an operation to have the mass removed, before being given the devastating news she had a highly aggressive, terminal glioblastoma. Ms Morris was told her prognosis was just 15 months but is here two-and-half years later, although she has been told the tumour is growing again.