Hormones quietly steer your energy, mood, weight and sleep. Here we translate the hormone and metabolism tests — thyroid, cortisol, insulin, the sex hormones and more — into clear, doctor-written explanations.
Estrogen levels do far more than govern fertility — this key hormone shapes everything from your bones and heart to your skin, mood, and sleep. Unlike most blood markers, estrogen has no single “normal” number: in women it rises and falls dramatically across the menstrual cycle, then drops at menopause. This guide explains what’s typical…
Prolactin is best known as the hormone that lets a new mother produce milk — its very name means “for milk”. But it is a curious hormone in one important way: unlike most, which the body actively switches on, prolactin is one the brain spends most of its time holding down. That single quirk explains…
Insulin resistance is one of the most important — and most overlooked — signals in metabolic health, often building silently for years before it ever shows up on a standard blood test. It happens when your cells stop responding properly to insulin, the hormone that moves sugar out of your blood and into your cells….
Understanding your testosterone levels by age helps you tell the difference between a normal part of getting older and a real problem worth checking. Testosterone is the main male sex hormone — it drives sex drive, muscle and bone strength, energy, and mood — and it naturally peaks in early adulthood before drifting down over…
Cortisol levels have become one of the most talked-about numbers in health — usually blamed for stress, stubborn belly fat, and poor sleep. But what does cortisol actually do, what are healthy cortisol levels, and how do you know if yours are too high or too low? Let’s separate the science from the hype and…
Your blood sugar level is one of the most important — and most misunderstood — numbers in your health. Millions of people have prediabetes and don’t know it, because it usually causes no symptoms at all. So what is a normal blood sugar level, what does your HbA1c mean, and when do the numbers signal…
TSH is the single most common thyroid test — and one of the most confusing numbers in medicine. The biggest source of confusion? A high TSH usually means an underactive thyroid, not an overactive one. If that seems backwards, you’re not alone. Let’s decode what your TSH level really means. What is TSH? TSH stands…