Sugar in vegetables.
Certain vegetables are surprisingly high in sugar. You should use these with moderation and care in a sugar-restricted diet.
Carrots are a surprise source. A medium-sized carrot contains more than the equivalent of a teaspoon of sugar. By contrast, a full celery stalk has virtually no sugar.
Beets also tend to be high in sugar. An ear of corn gives a solid teaspoon equivalent. Peas and potatoes (white and sweet) are also sugar rich, as are winter squash (like acorn and butternut squash), and parsnips.
Tender green leafy vegetables like spinach, lettuce, and salad greens are low in sugar, as are cucumber, asparagus, cabbage, radishes, mushrooms, cauliflower and broccoli.
The tomato is actually a fruit, although we treat it like a vegetable. Consider it mid-level in the sugar department.