A social worker's IBS caused her to suffer from extreme bloating that she looked at 'nine months pregnant'.
Emily Catterall, 24, from Preston, Lancashire, just a few months after she developed a severely swollen abdomen out of the blue.
When she became unable to shift the pounds, Miss Catterall joined.
Miss Catterall, who works for a social housing group, would not even care less about it.
Miss Catterall Turned 40,000 Instagram followers for advice, who suggested they try on at-home food test.
It is still intolerant to eggs, milk, yeast and beef.
After she was killed, Miss Catterall claims she felt 'amazing' just two days later and 8.5lbs (3.8kg) lighter three months on. She is now a size 10.
Emily Catterall's IBS caused her to suffer from extreme bloating that she looked at 'nine months pregnant'. Gluten and dairy, an Instagram follower suggested she tried an at-home food intolerance test. She is pictured after eliminating 'trigger' foods from her diet
At her worst, Miss Catterall's bloating caused her to go from a slim size to a size 14. Her agonizing condition became so severe she joined to sleep
'For about four months I had a bad stomach,' Miss Catterall said.
'I was nine months pregnant.
'It's mostly happened in the afternoon so I knew it was something to do with that.
'It would not last all night and I could not sleep. My stomach would be constantly churning and I had discomfort all the time.
'One night I was running with my friend and she could hear my stomach churning as I was running along. She told me "that's not right". '
Miss Catterall starts adjusting her diet to try and find the cause of her discomfort.
'I was changing my lunch so often to try and find out what was causing the problem that it just became impossible,' she said.
Dairy, but sometimes my lunch would not be any more.
'I took the medication for the remainder of my life. I wanted to find out what was causing it. '
Pictured left before, Miss Catterall can now fit in size 10 jeans (right) and has rejoined Weight Watchers to try and get back to her size 8 frame. It is now ready to go out for dinner with friends without worrying about what mysterious foods may be trigger IBS symptoms
Miss Catterall ordered a YorkTest food intolerance assessment after being recommended by one of her followers on social media.
'I had already done some research around food intolerances so decided to give YorkTest a go,' she said.
I was intolerant to egg white, egg yolk, cows milk, goats milk, and I had a borderline intolerance to yeast and beef.
'Even though I thought I had been eating a lot of these foods because of eggs and milk being hidden in all sorts of things.'
Since eliminating these foods from her diet, Miss Catterall finally feels able to exercise and socialize again. 'I felt amazing from day two,' she said.
After first quitting Weight Watchers in frustration, Miss Catterall has since rejoined and is hoping to get back to her former svelte self.
What is IBS and what are the symptoms?
IBS is a functional disorder of the gastrointestinal tract, characterized by recurrent abdominal pain and discomfort, characterized by alterations in bowel function.
It is hard to diagnose, as well as needs to be monitored over a period of approximately 12 weeks for a proper diagnosis.
Fortunately, more serious intestinal diseases such as ulcerative colitis and Crohn's disease, IBS does not cause inflammatory changes in bowel tissue, or increase the risk of colorectal cancer.
Symptoms of IBS can include: frequent bowel movements (more than three a day), infrequent bowel movement (less than three a week), abnormally stool form (lumpy / hard or loose / watery), abnormal stool passage (straining, urgency or feeling of incomplete evacuation), extreme bloating, lethargy, nausea, abdominal pain or cramping, flatulence and mucus in the stool.
Symptoms may be intermittent and can range from severe to mild.
'I'm back in my size 10 jeans and I'm aiming for my size eights.
'Not being bloated has made such a big difference to my confidence. I do not take any medication and, touch wood, I do not have any discomfort. I'm so happy. '
So Miss Catterall has slowly started reintroducing her 'problem' foods back into her diet after consultations with nutritional therapists.
'I started by reintroducing egg yolk first and then three days later I reintroduced egg white,' she said.
'I then tried natural yoghurt, a little bit of milk and I've had cheese since.
'I want to eat everything again. I keep waiting for something to trip.
'I just try not to overeat any of my triggers and a lot of the replacements, like this soya instead of dairy, I have enjoyed.'
Miss Catterall is speaking to others IBS sufferers to take a food intolerance test and get to the bottom of their discomfort.
'It's so much better to know what's causing problems. It's ruined my life daily, 'she said.
'Now I want everyone else to feel as good as I do. I'm working out and feeling much healthier now. It was all worth it for me. '
Dr Gill Hart, biochemist and scientific director at YorkTest Laboratories, said: 'Once you have a food intolerance sufferer understands their trigger foods, and has a period of eliminating them from their diets, there is evidence that they may be reintroduced into the diet in small doses at a later date.
'Many people are ready to eat again. Emily is doing so well. '