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  • Which "Healthy" Cereal Spikes You Most?

Pop quiz.

Three bowls sat on my counter this morning. Granola. Muesli. Bran flakes.

All three call themselves a healthy breakfast. I wore my glucose monitor and ate each one on its own, on three separate mornings, with nothing else added.

Only one of them barely raised my blood sugar. Guess which one spiked the most before you scroll down. I got it wrong myself, and I write this newsletter every day.

● The Reveal

🌾
Bran Flakes
⚡ Spike: +62 mg/dL
🥣
Store-Bought Granola
Spike: +52 mg/dL
🌰
Plain Muesli
Spike: +26 mg/dL

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Bran flakes won. My own doctor would probably laugh at that.

Here's the thing. Fiber is supposed to slow digestion down. But most bran flakes go through a process called flaking, where the grain gets crushed, steamed, and pressed flat before it's toasted. That breaks the bran's fiber structure into tiny pieces. In other words, the fiber can't do its job of slowing digestion anymore, because the manufacturing already broke it down for you.

Granola came in second, and that surprised me less. A lot of store granola gets its crunch from honey, brown sugar, or maple syrup baked right into the oats. The updated 2026 federal dietary guidelines say no amount of added sugar belongs in a healthy diet. Most granola still packs seven to twelve grams of it into one small bowl.

Muesli barely moved my blood sugar. It's raw rolled oats, nuts, and seeds. Nothing baked, nothing sweetened.

It's revealing. The cereal with the healthiest-sounding name spiked the most. And the plainest, most boring bowl on the counter held the steadiest line.

BRAN FLAKES, ALONE
Peak glucose spike
+62
   
mg/dL above fasting
Start
92
mg/dL · 0 min
Peak ⚡
+62
mg/dL · 45 min
Crash ↓
78
mg/dL · 115 min
Source: Continuous glucose monitor (Libre 3)

This is one person's experiment, not medical advice. Everyone's body responds differently.

● The Scoreboard

🌾 Bran Flakes
+62
   
🥣 Store-Bought Granola
+52
   
🌰 Plain Muesli
+26
   

So here's the swap. Keep the granola in the pantry for texture, not for breakfast on its own.

Stir one spoonful of it into a bowl of plain muesli with yogurt. You still get the crunch. But the raw oats, the nuts, and the protein in the yogurt slow the whole bowl down together.

And skip the bran flakes altogether. Not because bran is bad. Because the box lied about what the flaking did to it.

Stay steady

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