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.