Brussels Sprouts

Brussels sprouts are miniature cabbage-like vegetables belonging to the Brassica oleracea species, the same plant family as broccoli, cabbage, and kale. They originated in Belgium and are now grown widely across Europe and North America. Commonly roasted, steamed, or sautéed, they appear fresh in markets year-round and are a staple in many cuisines.

A 100g serving of cooked Brussels sprouts provides approximately 36 calories, 8.3g of carbohydrates, 2.5g of protein, and 3.8g of dietary fiber. They are particularly high in vitamin C (about 69% of daily value per 100g cooked) and vitamin K (about 140–150% of daily value). Brussels sprouts contain glucosinolates, sulfur-containing compounds that break down during cooking and digestion into bioactive metabolites such as isothiocyanates, which have been studied for potential cancer-preventive properties. Some individuals experience digestive discomfort—bloating or gas—due to their fiber content and these sulfur compounds, which are fermented by colonic bacteria.

Vitamin K and Clotting

Brussels sprouts are exceptionally high in vitamin K, a fat-soluble nutrient essential for blood coagulation. Individuals taking warfarin or other vitamin K-dependent anticoagulants should consume Brussels sprouts consistently rather than sporadically, as sudden increases in intake can reduce medication efficacy. Consistent consumption maintains stable blood levels of the nutrient and allows anticoagulant dosing to be calibrated appropriately. Always inform your healthcare provider of your typical intake of high-vitamin-K foods so your dose can be managed safely.

Digestive Tolerance and Portion Guidance

Bloating and flatulence are the primary tolerance issues with Brussels sprouts, occurring in individuals sensitive to fermentable oligosaccharides and sulfur compounds. Cooking methods that break down cell walls (steaming, roasting at high heat) reduce the likelihood of gas compared to raw consumption. Most people without IBS or FODMAP sensitivity tolerate 100–150g of cooked Brussels sprouts without significant discomfort. Brussels sprouts are classified as high in FODMAPs (fructans and GOS) by Monash University. Those following a low-FODMAP diet should limit portions to approximately 1 sprout (~18g) per serving, as per Monash University guidance. Individuals with irritable bowel syndrome should consult a registered dietitian familiar with the low-FODMAP approach before incorporating Brussels sprouts regularly.