Why PeriFlow exists
PeriFlow is a wellness companion for women in perimenopause. It gives you a simple daily plan for what to eat, how to move and when to rest, built for cycles that have stopped being predictable, and it learns from what you log to show you the patterns that are yours.
Most health apps treat the body as if it runs on a flat schedule. Eat this many calories. Fast this many hours. Do this workout. But in perimenopause hormones swing in ways that don't follow a neat pattern, so the same advice can work one week and fall flat the next. Nobody can tell you in advance which. Your own data can.
PeriFlow was built to close that gap.
What makes PeriFlow different
Your patterns, not the average. Log how you sleep and feel, and PeriFlow looks for links between your sleep, meals, things like caffeine or alcohol, and your symptoms. It only tells you about a pattern once there's enough data behind it, and what you do with it is up to you.
Your cycle as context. PeriFlow estimates where you are in your cycle (Rise, Crest or Root) and uses it to explain what you're noticing, like hunger rising before your period. It adjusts gently: an optional fasting window that pauses before your period, regular meals then, and a twice-a-week strength minimum in every phase.
Built for irregular cycles. Perimenopause means cycles that stretch, shorten, skip, and surprise you. PeriFlow handles all of it — including anovulatory cycles, spotting, and gaps of 60+ days — without defaulting to a 28-day assumption.
Grounded in science. Every recommendation in PeriFlow is informed by peer-reviewed research in reproductive endocrinology, metabolic science, and sports medicine. We cite our sources, explain the mechanisms, and never make claims we can't support.
Seven diet styles. Mediterranean, omnivore, vegetarian (with a pescatarian option), vegan, paleo, keto, and custom. Every meal suggestion respects your dietary choices — not just in name, but in actual nutritional composition.
Who PeriFlow is for
Women aged 40–55 navigating perimenopause. Women who have tried generic health apps, calorie counters, and fasting timers — and found that what used to work has stopped working. Women who want a system that works with their biology instead of ignoring it.
PeriFlow is not a medical device and does not provide medical advice. It is a wellness companion that helps you understand your cycle, make informed choices, and feel like yourself again.
The science behind the phases
PeriFlow's three-phase model — Rise (follicular), Crest (ovulatory), and Root (luteal) — maps the hormonal patterns that drive how your body responds to food, fasting, and movement across the menstrual cycle.
- Rise phase: Estrogen climbs, insulin sensitivity improves, and the body handles fasting and higher-intensity exercise well.
- Crest phase: Estrogen peaks around ovulation. Energy is high, but the window is short — typically 3–4 days.
- Root phase: Progesterone rises, energy needs go up, and the stress response tends to be more reactive. Extended fasting becomes counterproductive. The body needs more fuel, more complex carbohydrates, and gentler movement.
This isn't a philosophy — it's how reproductive endocrinology works. Understanding it changes everything about how you eat, fast, and train during perimenopause. Read more in our guides to perimenopause and perimenopause symptoms.
Get in touch
Questions, feedback, or partnership enquiries: hello@periflow.io