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Physician-written perspectives on the latest research and the questions patients ask most. Start with the newest article below, or explore a topic.

Darrell Wilcox, MD 9/28/26 Darrell Wilcox, MD 9/28/26

Your Glucose Is Normal. Your Insulin Already Isn't.

Insulin rises years before glucose ever moves. Low SHBG, a high triglyceride-to-HDL ratio, and acanthosis nigricans are all reasons to check fasting insulin directly.

Darrell Wilcox, MD 9/21/26 Darrell Wilcox, MD 9/21/26

Your Labs Might Be Showing a Sleep Problem, Not a Testosterone Problem

Most of your daily testosterone release happens during sleep. A single rough week can drop a lab result before anything's actually wrong.

Darrell Wilcox, MD 9/4/26 Darrell Wilcox, MD 9/4/26

Your Testosterone Isn't Just Declining With Age. It's Declining Across Generations.

In 2017, LabCorp lowered its normal testosterone range for men. That change didn't happen in a vacuum, it responded to a decline researchers had already been tracking for years.

Darrell Wilcox, MD 8/24/26 Darrell Wilcox, MD 8/24/26

Your Thyroid Isn't Broken. The Enzyme That Activates It Might Be.

Your thyroid gland might be working fine. The enzyme that activates thyroid hormone at the cellular level is a different story. Here's the mechanism.

Darrell Wilcox, MD 8/21/26 Darrell Wilcox, MD 8/21/26

Your Thyroid Labs Say Normal. Here's Why You Still Feel Hypothyroid.

Your TSH came back normal, but you still feel exhausted, cold, and foggy. Here's why TSH alone can miss what's actually happening at the cellular level.

Darrell Wilcox, MD 4/18/26 Darrell Wilcox, MD 4/18/26

Why Your Labs Look Normal But You Feel Terrible

Your doctor says your labs are fine. So why do you still feel exhausted, foggy, and off? The problem isn't your results — it's what "normal" actually means, and what most standard panels never measure.