Pop quiz.

Three fruits. One fruit bowl.

Grapes. Mango. Pineapple.

All three get called healthy. All three taste sweet. But my glucose monitor says only one of them raises my blood sugar the most, and it's not the one most people point to first.

Guess before you scroll.

● The Reveal

Pineapple wins. And it isn't close.

That surprised me. Mango tastes sweeter. It feels like the "riskier" fruit. But pineapple carries less fiber for the same amount of sugar. In other words, there's less in the fruit to slow the sugar down on its way into your blood.

The University of Sydney's glycemic index database backs this up. Grapes sit in the mid-40s. Mango sits in the low-50s. Pineapple runs highest of the three, up near 60. Same sweetness on your tongue. Different math for your body.

Meanwhile, a study out of George Mason University this year found something that cuts the other way. Adults with prediabetes who ate a whole mango daily for six months ended up with better blood sugar control and better insulin sensitivity than a group eating a low-sugar granola bar instead. The mango had triple the sugar of the bar.

So sugar count alone doesn't tell you much. What matters more is what's attached to that sugar. Whole fruit comes with fiber and water. A granola bar comes with refined flour and oil. The mango still raised blood sugar in the moment. It just didn't cause the same long-term damage as the processed swap.

It's a good reminder. The size of one spike and the size of the long-term effect aren't the same question.

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

● Scoreboard

You don't have to cut pineapple out. If it's your favorite, pair it with a handful of almonds or a scoop of plain Greek yogurt. The fat and protein slow the rise. So does eating it after a meal instead of on an empty stomach.

Grapes still come out lowest of the three here. Tomorrow we go deeper. Grapes against berries, head to head.

Stay steady