A fascinating new randomized, controlled crossover trial, the VESSEL study, has revealed that soups made from cruciferous vegetables like broccoli, kale, cabbage, and cauliflower significantly reduce post-meal glucose spikes, compared to starchy vegetables like potatoes, pumpkin, and sweet potato.

      Study Snapshot

      Conducted on 18 older adults (median age 68) with mild hypertension but no diabetes, the trial compared the effects of two 2-week soup interventions, one made of cruciferous vegetables and the other of root/squash vegetables. The cruciferous soup was prepared using a blend of broccoli (40%), cabbage (25%), cauliflower (25%), and kale (10%). The roots and squash soup featured carrot (20%), potato (40%), pumpkin (30%), and sweet potato (10%) as its main ingredients. Participants were blinded and monitored with continuous glucose monitors (CGMs) throughout the study.

      Key findings:

• Cruciferous vegetables like broccoli, cabbage, cauliflower, and kale stabilize post-meal blood sugar better than root vegetables such as potatoes, carrots, and pumpkin.
• In a 2-week study of older adults with mild hypertension, cruciferous veggies:
• Reduced 2-hour post-prandial glucose by 0.14 mmol/L 20.1 mmol/L/min after Lunch and Dinner respectively
• Decreased glycaemic variability by 2%, smoothing blood sugar fluctuations
• Dinner meals showed the most significant benefit, while average daily glucose remained similar.

      Why It Matters for Diabetes & Metabolic Health

• Even in non-diabetic individuals, cruciferous vegetables improved glucose dynamics, suggesting amplified benefits in people with prediabetes or diabetes.
• These vegetables are rich in sulforaphane, fiber, vitamin K, and nitrates, all of which play a role in improving insulin sensitivity, vascular health, and inflammation.
• The findings build on earlier research linking cruciferous intake to lower triglycerides and blood pressure, suggesting a multifaceted metabolic benefit.

      Public Health Implication

      Despite their benefits, cruciferous vegetables remain among the least consumed globally. Average intake in the study opulation was just 26 g/day, far below dietary guidelines which is about 327g/day

      With over 541 million people at risk of T2DM worldwide due to impaired glucose control, this study reinforces the urgent need to:

• Increase cruciferous vegetable intake
• Encourage whole food-based interventions for glycaemic control.
• Utilize digital health tools (CGMs, food logging, apps) to track individual response to dietary choices

      GEMS Takeaway

      Not all vegetables are equal.

      Cruciferous vegetables appear to offer unique glycemic and vascular advantages over starchy or sweeter options like pumpkin and potatoes.

      Simple interventions like soup, when done right can make a measurable difference in post-meal glucose control.

      This study paves the way for larger trials in people with diabetes, and for precision nutrition approaches using CGMs and personalized feedback.