I’m Nina Halvorsen. I spent nineteen years in quality control and product development for fermented dairy (yogurt, kefir, starter cultures) before I left the industry in 2019. I am not a doctor, dietitian, or registered nutritionist, and nothing on this site is medical advice.
At 43, in perimenopause, my own digestion fell apart. Colonoscopy, gastroscopy, bloodwork, an ultrasound: seven appointments across two years, all clear, and not one of them mentioned the word perimenopause. I found the connection myself, two years later, reading the literature the way I read it at work: checking sample size and who funded the study.
Fortylight exists because that gap (between what gastroenterology knows about hormones and gut motility, and what actually gets said in a ten-minute appointment) is still there for most women. I’m not fixed. My gut is settled: more predictable than it was, not symptom-free.
What this site is
Every article states the mechanism, names the evidence behind it, and grades how strong that evidence actually is (strong, mixed, thin, or anecdotal) in an Evidence Strip you’ll see throughout the site. I say when something is well established and when it isn’t, including for things I have a financial interest in recommending.
What this site isn’t
It isn’t a substitute for a clinician, and it doesn’t diagnose anything. If you have blood in your stool, unexplained weight loss, persistent vomiting, difficulty swallowing, bleeding after menopause, or symptoms that started after age 50, see a doctor before trying anything you read here. Those are outside what any article on this site is built to address.
Some articles include affiliate links, disclosed in plain text before the first one appears. I turn down offers that don’t fit the woman this site is written for, whatever the commission. The full policy is on the editorial policy and disclosure pages.