Health markers, explained

Summer vs Winter Blood Tests: Seasonal Changes

How seasons change vitamin D, TSH, hemoglobin, and CRP levels, and when to schedule blood tests.

Smartwatches: HRV, SpO2, and Sleep Data

What smartwatch HRV, SpO2, and sleep data mean, when they matter, and what their limits are.

Inflammation and Diet: How Food Affects CRP

How the Mediterranean diet, omega-3, fiber, and processed foods affect CRP and chronic inflammation.

Vegan Diet: What to Check in Your Blood Tests

Key blood tests for vegetarians and vegans: B12, iron, ferritin, vitamin D, zinc, and other markers.

Menopause: The Most Important Blood Tests

Key menopause blood tests: FSH, estradiol, lipids, TSH, vitamin D, glucose, and inflammation markers.

B12 and Folate: Nerve and Blood Health

B12 and folate deficiency can affect nerves and blood long before symptoms appear. Who is most at risk and what you need to know.

Kidney Function: What Creatinine and eGFR Reveal

Creatinine and eGFR show how well your kidneys filter blood. Learn what these markers mean and why early detection of problems matters.

Testosterone: What a Man's Blood Test Really Shows

Testosterone governs muscles, energy, mood and metabolism. Learn what your blood test numbers mean and how lifestyle drives levels.

Vitamin D: Immunity, Bones and Mood

Vitamin D is far more than a bone vitamin. It regulates immunity, mood and muscle function. Who is at risk of deficiency — and what to do about it.

Liver Enzymes: What ALT, AST and GGT Tell You

ALT, AST and GGT are three liver stress markers in a standard blood test. Learn what elevated levels mean and how lifestyle drives results.

Constant Fatigue: What 5 Blood Markers Can Reveal

Fatigue is the most common complaint doctors hear — and one of the most common cases where the answer hides in a simple blood test. Five markers worth knowing.