Sugar and acne: the glycemic index explained

Fast sugar → insulin → sebum

When you eat something very sugary or refined, your blood sugar spikes fast. The body responds with a burst of insulin, which in turn triggers IGF-1. The result: more sebum and more inflammation, the perfect ground for a pimple.

The problem isn't sugar 'as such', but the harshness of the spike it causes. Hence the value of thinking in glycemic index rather than calories.

The glycemic index, simply put

The glycemic index (GI) measures how fast a food raises your blood sugar. High GI = sharp rise (sugar, sodas, white bread, pastries, candy). Low GI = gentle rise (vegetables, legumes, whole fruit, whole grains).

It's the best-documented dietary lead on acne: low-glycemic-load diets are the ones most often linked to improvement.

Foods that spike (and those that steady)

Spike: sodas and juices, candy and pastries, white bread, white rice, mashed potato, sugary breakfast cereals. These are the priority targets.

Steady: vegetables, legumes (lentils, chickpeas), whole fruit rather than juice, oats, sourdough whole bread, nuts. The idea isn't to cut everything, but to rebalance.

Steady without depriving yourself

You can keep some sugar while blunting the spike: pair it with fiber, protein or fat (a square of chocolate after a meal rather than on an empty stomach, fruit with a handful of almonds). Order matters too: starting a meal with vegetables slows the rest.

These tweaks are sustainable, unlike strict diets dropped after two weeks. And it's consistency, not perfection, that shows on the skin.

To test on yourself

Cut back the high-GI foods most present in your diet for 4 to 6 weeks, noting how your skin evolves. Sugar is a common lead, but its weight varies from person to person, your observation decides.