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Why Being Thin Doesn’t Guarantee Good Health

Yiwen Lu, MS, RD
June 11, 2025

You Can’t Always See the Risk

You might be surprised to learn that not all body fat shows up where you can see it. Some people look slim on the outside but carry unhealthy fat deep inside—wrapped around their organs. This hidden fat is called visceral fat, and it can increase your risk for serious health problems, even if your weight looks “normal.”

Let’s break it down.

Visceral Fat vs. Subcutaneous Fat: What’s the Difference?

Why Visceral Fat Matters

Even if you're not visibly overweight, having too much visceral fat can:

  • Raise your blood pressure
  • Increase blood sugar levels
  • Make your body more resistant to insulin
  • Increase your risk for heart disease, stroke, and type 2 diabetes
  • Lead to fatty liver disease

Visceral fat is more active than regular fat—it releases harmful chemicals that affect how your body works.

Clues You Might Have Hidden Fat

You might have more visceral fat if:

  • Your waist is larger than 35 inches (women) or 40 inches (men)
  • You’re inactive, especially sitting most of the day
  • You eat a lot of sugary, fried, or processed foods
  • You have a family history of diabetes or heart disease
  • You’ve been diagnosed with high blood pressure, prediabetes, or high cholesterol

Even people who are thin can still be “metabolically unhealthy” due to visceral fat.

How to Reduce Visceral Fat

You can’t target visceral fat with crunches or creams—but you can shrink it with smart daily habits:

1. Focus on Whole Foods

  • Eat more vegetables, fruits, whole grains, lean proteins, and healthy fats
  • Cut back on sugar, white flour, fried foods, and alcohol

2. Move Your Body Daily

  • Even a 20-minute brisk walk can help
  • Aim for cardio + strength training 3–5 days a week

3. Sleep and Stress

4. Track Your Progress

  • Measure your waist (not just your weight)
  • Talk to your doctor about lab tests for blood sugar, cholesterol, and triglycerides

Takeaways

Just because you don’t look overweight doesn’t mean your body is in the clear. Visceral fat is the kind you can’t see—but it matters most for your health. The good news? You can turn things around with small, steady changes to how you eat, move, and rest.

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