How the Ultrahuman Ring tracks cycle temperature
The Ring reads skin temperature continuously overnight and reports deviation from your own baseline. How that works, how accurate it is, and where it …
Sep 21, 2026
How to get more REM sleep explained
What REM sleep does, how much you actually need, and the habits that measurably increase it – based on sleep-stage data from Ultrahuman Ring members. …
Sep 19, 2026
REM sleep explained: Discover what causes low REM nights
What REM sleep is, what it does, how much is normal by age, and the most common cause of lost REM
Sep 16, 2026
Why a late bedtime still leaves you tired – even after 7 hours' sleep
Going to bed after midnight can still leave you tired, even with a full night's sleep. It's all to go with your circadian rhythm
Sep 15, 2026
VO2 Max explained: Why it's the leading predictor of long-term health
VO2 max measures how well your body uses oxygen during hard exercise, and it's one of the strongest predictors of long-term health there is.
Sep 14, 2026
How to lower your resting heart rate
A lower resting heart rate is a sign of good fitness. We explain how to lower RHR – both short term and your long term baseline
Sep 14, 2026
A1C calculator chart: Normal range and the limitations of A1C explained
What does your A1C number really mean? Use our A1C-to-glucose chart to understand your results, where the test misleads, and how CGM fills the gaps.
Sep 10, 2026
Normal blood sugar levels by age explained
What's a normal blood sugar by age? Dr. Mukul Mittal walks you through the chart — fasting, post-meal, A1C, and how targets change with life stage.
Sep 09, 2026
Maltitol explained: Does the sugar-free sweetener spike glucose?
Does maltitol raise blood sugar or cause stomach upset? We break down its real effects, why its laxative reputation is overblown
Sep 08, 2026
Does Coke Zero raise blood sugar? Not in the way you might think
Coke Zero is sugar-free and calorie-free and Ultrahuman data shows it doesn't usually produce a glucose spike. But caffeine can cause fluctuations in …
Sep 08, 2026
Ovulation Symptoms: A Complete Cycle-Tracking Guide
What are the signs of ovulation? We break down cervical mucus, BBT, and the LH surge — and the most reliable ways to track your fertile window.
Jun 16, 2026
Follicular Phase Explained: Energy, Workouts, and Mood
What is the follicular phase? We break down the first half of your cycle — how rising estrogen shapes energy and mood, and what the science says about …
Jun 16, 2026
Is Stevia Bad for You? What the Research Shows
Is stevia bad for you? We break down what the research says on safety, blood sugar, and the additives in "stevia" blends that actually matter
Jun 12, 2026
Heart Rate Zones Explained: Zone 1–5 for Fat Burn vs Cardio
Heart rate zones explained simply. We break down Zones 1–5, how to calculate yours, and the truth about the fat-burning zone vs cardio.
Jun 10, 2026
What Is Perimenopause? Symptoms, Stages, and What to Expect
What is perimenopause? We break down the symptoms (cycle changes come first, not hot flashes), when it starts, how long it lasts, and when to see a …
Jun 09, 2026
What's a Good Resting Heart Rate by Age?
What's a good resting heart rate by age? We break down real Ring data from 500,000+ members — and why RHR barely changes with age.
Jun 08, 2026
Is Sucralose Bad For You? What the Research Shows
Does sucralose raise blood sugar? We break down what the research shows about sucralose, from its effect on insulin and your gut to whether it's safe.
Jun 08, 2026
Is Your Excessive Hunger Polyphagia? When It Signals Insulin Resistance
Still hungry after a full meal, day after day? We break down polyphagia — when excessive hunger signals insulin resistance or diabetes, and when to …
Jun 08, 2026
Types of Sugar Explained: How Each One Affects Your Body
What's the difference between glucose, fructose, sucrose, and HFCS? Dr. Mukul Mittal walks you through each type of sugar and what each one does in …
Jun 05, 2026
How to Get More Deep Sleep: 9 Tactics Backed by Research
How to get more deep sleep? Dr. Mukul Mittal walks you through 9 evidence-backed tactics — what the research shows and what actually works.
Jun 05, 2026
What Is Erythritol? Calories, Glucose Effect, and Safety
What is erythritol — and is it safe? Dr. Mukul Mittal walks you through the glucose effect, calories, side effects, and what the research shows.
Jun 05, 2026
Preeclampsia Symptoms: Early Warning Signs in Pregnancy
What are the early warning signs of preeclampsia? Dr. Mukul Mittal walks you through the symptoms, risk factors, and when to call your healthcare …
Jun 05, 2026
How Many Steps a Day to Lose Weight? What the Research Shows
How many steps a day to lose weight? Dr. Mukul Mittal walks through the research, calorie math, and why diet drives most of the result.
Jun 05, 2026
What's a Normal Respiratory Rate? Adults, Kids, and Athletes
What's a normal respiratory rate? Dr. Mukul Mittal walks through the ranges by age, what affects them, and when to see a clinician.
Jun 03, 2026