Croissant
Refined white flour plus butter: a high glycemic load with added fat, so it spikes insulin and packs a lot of calories per bite.
FatTonic Facts
Croissant · per serving 1 medium (60g)
Poor · works against fat-burning
| Factor | Amount | Points |
|---|---|---|
| Start | 100.0 | |
| Glycemic load | 17 | −37.4 |
| Sugar (g) | 6 | −4.8 |
| Processing | ultra-processed | −24.0 |
| Fiber (g) | 1 | +1.6 |
| Protein (g) | 5 | +3.5 |
| Glycemic index | no published test found | |
| Carbs (g) | 27 | |
| Fat (g) | 12 |
Score model v1
Nutrients: USDA FoodData Central, record 174987 (Croissants, butter), public domain, checked 2 Oct 2026.
Glycemic index: no published test found. Searched 28 Oct 2026 in Atkinson et al., International Tables of Glycemic Index and Glycemic Load Values: 2008: no croissant in Table A1. The score still uses 67, a value with no recorded source, until a test is found.
Per 100 g (USDA record; serving 60 g): carbs 45.8, sugar 11.3, fiber 2.6, protein 8.2, fat 21 g.
What this means for fat-burning
Why this score: glycemic load 17 set it, −37.4 points. Source: USDA FoodData Central, FDC 174987.
Being ultra-processed, it is also easy to overeat.
See how your whole day scores — free Metabolic Score →This food and 199 more, scored on your phone.
Among the 200 rated foods
Croissant scores 39, rated Poor. It scores higher than 17% of the 200 rated foods.
Rated foods per band: Avoid 0–19: 11; Poor 20–39: 23; Moderate 40–59: 34; Good 60–79: 45; Excellent 80–100: 87.
Frequently asked questions
Does croissant spike insulin?
Glycemic load 17 for 1 medium (60g); FatTonic Score 39/100 — it works against fat-burning.
Is croissant good for fat loss?
Poor (39/100): croissant works against fat-burning.