Hi, I had digestive issues (pain, constipation, no appetite) that got better with the fructose elimination / fodmap diet. But then I lost 8 - 10 pounds. Doctor thinks IBS, but I keep hearing weight loss = cancer!! It s been a few weeks, shouldn t I have gained weight by now? I m still running outdoors a few times a week. Blood and fecal tests were normal. Should I have a colonoscopy! I m 45 and female.