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Summary
On episode 338 of 40+ Fitness, Coach Allan sits down with Dr. Jonny Bowden, a board-certified nutritionist known as the nutrition myth buster and the bestselling author of 13 books, to discuss his book Smart Fat.
Jonny's core position is that the quality of your food, not the percentage split between protein, carbs, and fat, is what actually determines health. He argues good and bad fat has nothing to do with whether it comes from an animal or a plant. The only thing that matters is whether the fat is toxic (heated and damaged, trans fat, industrial vegetable oil) or not.
The conversation covers metabolic syndrome and the blood markers worth tracking, why dietary cholesterol doesn't move blood cholesterol for most people, the difference between glycemic index and glycemic load, grass-fed versus factory-farmed meat, and his simple 5-5-10 eating framework.
Links
- https://jonnybowden.com
- Episode 343 – The truth about cholesterol levels with Dr. Jonny Bowden
Key Takeaways
- Metabolic syndrome is far more common than people realize. Roughly a third of adults have it, most without knowing, and it's defined by a cluster of five markers: low HDL, high triglycerides, abdominal obesity, high blood pressure, and insulin resistance.
- Your triglyceride-to-HDL ratio is a simple, powerful heart disease predictor. Divide triglycerides by HDL from any basic blood test; a ratio near 2:1 is good, while a ratio climbing toward 4:1 or 5:1 signals high risk, and Jonny says it predicts heart disease better than most standard markers.
- Dietary cholesterol doesn't raise blood cholesterol for most people. Eggs and shrimp have essentially zero effect on blood cholesterol levels for the roughly 99% of the population without the genetic condition familial hypercholesterolemia, a point Jonny says most doctors haven't caught up on.
- Good fat versus bad fat isn't about animal versus vegetable. The only real marker is whether a fat is toxic, meaning heated and damaged, trans fat, or a highly processed vegetable oil like canola or soybean, versus a stable, unprocessed fat like coconut oil or grass-fed beef fat.
- Saturated fats like coconut oil and Malaysian palm oil are genuinely healthy. They stand up to heat far better than delicate oils like extra virgin olive oil, which loses its beneficial polyphenols the moment you cook with it.
- Glycemic load beats glycemic index for predicting blood sugar impact. Glycemic index measures a fixed 50-gram carb portion, while glycemic load adjusts for the actual amount you eat, which is why a modest pasta serving spikes blood sugar far more than the index alone suggests.
- Grass-fed meat and factory-farmed (CAFO) meat are nutritionally different foods. Grain-fed, confined animals carry antibiotics, hormones, and inflammatory omega-6 fats, while pastured, grass-fed animals provide anti-inflammatory omega-3 fats and none of the drug residue.
- Carbohydrate is not an essential nutrient, but whole-food carbs still matter. Fat, protein, and fiber are the three essential dietary components; carbs aren't required physiologically, though fruits and vegetables still supply fiber, polyphenols, and micronutrients worth keeping in the diet.
- The 5-5-10 plan is a flexible target, not a rigid formula. Aim for roughly 5 servings of smart fat, 5 of clean protein, and 10 of fiber a day, treated as an aspirational guideline like a 10,000-step goal rather than something to obsess over.
“The marker for good and bad fat has one and only one characteristic. Is it a toxic fat or is it not a toxic fat?”
Dr. Jonny Bowden