What is metabolic syndrome?

The 5 criteria for metabolic syndrome, the diabetes and heart disease risk it carries, and how to reverse it.

Written by

Carb Lens Editorial

Nutrition writers & product team

Medically reviewed by

Dr. Alicia Nguyen, RD, CDCES

Registered Dietitian · Certified Diabetes Care & Education Specialist · 12+ years clinical experience

Published July 7, 2026 4 min readEditorial policy

Metabolic syndrome is a cluster of conditions that together dramatically raise the risk of type 2 diabetes and heart disease.

The five criteria

You have metabolic syndrome if you meet 3 of these 5:

**Waist circumference**: 35+ inches (women), 40+ inches (men)
**Triglycerides**: 150+ mg/dL
**HDL cholesterol**: under 40 mg/dL (men), under 50 mg/dL (women)
**Blood pressure**: 130/85+ mmHg
**Fasting glucose**: 100+ mg/dL

Why the cluster matters

These conditions share a root cause: insulin resistance. Together they multiply the risks individually:

5x higher type 2 diabetes risk
2–3x higher heart disease risk
Higher risk of stroke, NAFLD, certain cancers

The single best biomarker

The triglyceride-to-HDL ratio (TG ÷ HDL) is a powerful proxy: - Under 2: ideal - 2–4: insulin resistance likely - Over 4: severe insulin resistance

What reverses it

The same interventions work for all 5 criteria simultaneously:

**Cut refined carbs and sugar** — biggest single lever
**Lose 5–10% of body weight** — most metabolic markers normalize
**Strength train 2–3x/week** — builds insulin-sensitive muscle
**Walk 7,000+ steps/day** — improves all 5 markers
**Sleep 7+ hours** — non-negotiable
**Reduce alcohol** — directly improves triglycerides
**Eat fatty fish 2x/week** — omega-3s lower triglycerides

Expected timeline

Week 2: blood pressure improves
Month 1: triglycerides drop 20–30%
Month 3: fasting glucose normalizes for many
Month 6: HDL rises, waist shrinks meaningfully

The good news: metabolic syndrome is highly reversible — usually within 6 months of consistent effort.

About the author

Carb Lens Editorial — Nutrition writers & product team. The Carb Lens editorial team writes practical, source-checked guides on carbs, blood sugar, and everyday nutrition. Every article is drafted by our writers and cross-referenced against USDA FoodData Central and peer-reviewed clinical guidelines.

How we source and review this article

Nutrition figures come from the USDA FoodData Central database. Blood-sugar and glycemic-load framing follows guidance from the American Diabetes Association and World Health Organization healthy-diet recommendations. Every article is medically reviewed by Dr. Alicia Nguyen, RD, CDCES before publishing and re-checked on a rolling basis. See our full editorial & medical review policy.

This article is for general information and is not a substitute for medical advice. If you're managing diabetes or another condition, always defer to your care team.