Simple syrup made from plain white sugar and water is low FODMAP. The two ingredients, granulated sugar (sucrose) and water, contain none of the fermentable carbohydrates that trigger symptoms in people with IBS. As long as you stick to standard table sugar and keep portions moderate, simple syrup is one of the safer sweetener options on a low FODMAP diet.
Why Sucrose Is Low FODMAP
Table sugar is a molecule made of one glucose and one fructose bonded together in equal amounts. That 1:1 ratio is the key detail. Fructose only becomes a FODMAP problem when it appears in excess of glucose, because your small intestine absorbs fructose less efficiently on its own. When glucose is present in equal or greater amounts, it helps pull fructose across the intestinal wall through a separate transport pathway. Sucrose delivers glucose and fructose in a perfectly balanced pair, so both get absorbed before they ever reach the large intestine where fermentation and symptoms happen.
Monash University, the research group behind the low FODMAP diet, confirms this directly: white sugar does not need to be avoided on the diet. It can be consumed in moderate amounts in line with normal healthy eating. No specific gram threshold has been flagged as high FODMAP for sucrose the way it has for, say, lactose or fructans.
What’s in Simple Syrup
Traditional simple syrup is nothing more than a 1:1 ratio of sugar to water, heated until the sugar dissolves. One cup of granulated sugar combined with one cup of water. That’s it. There are no hidden ingredients, no added fructose, no polyols. Water is obviously FODMAP-free, and the sugar is safe as described above. By volume, a tablespoon of simple syrup contains roughly half a tablespoon of dissolved sugar, so even a generous pour in a drink or recipe stays well within moderate territory.
Rich simple syrup uses a 2:1 sugar-to-water ratio for a thicker consistency. This is also low FODMAP since it contains the same two ingredients, just in different proportions. The sugar is more concentrated per teaspoon, but sucrose itself isn’t restricted on the diet.
Homemade vs. Store-Bought Syrup
If you make simple syrup at home with granulated sugar and water, you’re in the clear. The risk comes from commercial products. Some store-bought cocktail syrups and flavored syrups swap out sucrose for high-fructose corn syrup, which contains more fructose than glucose and is a known FODMAP trigger. Others add honey, agave, fruit juice concentrates, or natural flavoring extracts that may introduce fructans or excess fructose.
Before buying a bottled simple syrup, check the ingredient list for these common high-FODMAP additions:
- High-fructose corn syrup: excess free fructose, high FODMAP
- Honey: high FODMAP for fructose and fructans at even one tablespoon
- Agave syrup or agave nectar: very high in free fructose
- Fruit juice concentrates (apple, pear): concentrated fructose sources often used as “natural” sweeteners
If the label lists only sugar (or cane sugar) and water, the product is functionally identical to homemade and safe on a low FODMAP diet.
Flavored Simple Syrups to Watch For
Plain simple syrup is straightforward, but flavored varieties need more scrutiny. Vanilla simple syrup made by steeping a vanilla bean in the sugar-water mixture is fine. Ginger simple syrup is also generally safe, since fresh ginger is low FODMAP in small amounts. Mint works too.
The ones to be cautious with are syrups flavored with honey, apple, pear, mango, or watermelon, all of which are high-FODMAP fruits or sweeteners. Lavender and chamomile syrups are less studied, so if you’re in the elimination phase, it’s worth keeping those simple and sticking with flavoring agents you already know you tolerate. Citrus zest (lemon, lime, orange) is a reliable option for adding flavor without FODMAP risk.
Better and Worse Sweetener Alternatives
If you’re comparing simple syrup to other liquid sweeteners, it ranks among the safest options. Maple syrup is also low FODMAP at moderate servings (about two tablespoons). Golden syrup, made from sugar cane, is similarly safe in small amounts.
Honey is the most common swap that backfires. Despite being “natural,” honey is classified as high FODMAP for both fructose and fructans. Even a single tablespoon (about 21 grams) can provoke symptoms. Some people tolerate up to a teaspoon (around 7 grams), but this varies widely. Agave syrup is worse still, with a fructose content that rivals high-fructose corn syrup. Both should be avoided during the elimination phase.
For anyone using simple syrup in cocktails, coffee, or baking, the takeaway is simple: homemade sugar-and-water syrup is a reliable, low FODMAP choice that doesn’t require careful portioning the way many other sweeteners do.