Not cappuccinos, not sodas. Harvard-trained AIIMS gut doctor reveals gut-friendly drink choices

What you sip through the day may be doing far more to your gut than you realise. From the morning coffee ritual to evening coolers, everyday beverages quietly shape digestion, energy levels, and metabolism. Harvard-trained AIIMS doctor Dr Saurabh Sethi recently took to Instagram to break down common drinks people consume daily and rated them based on their impact on gut health. His clear, no-nonsense rankings cut through confusion and highlight what truly helps—and harms—your digestive system.

Black Coffee

Dr Saurabh Sethi began with black coffee, rating it 8 out of 10. According to him, black coffee can improve alertness and boost metabolism when consumed correctly. He cautioned against adding sugar or cream, explaining that these additions reduce its benefits. A small splash of milk is acceptable, whether dairy or plant-based, but simplicity is key.

Green Tea

Green tea scored even higher, earning 9 out of 10. Dr Sethi highlighted its antioxidant content and mild caffeine, which provides a gentle energy lift without causing blood sugar spikes. This makes green tea a strong everyday option for people looking to support gut health while staying energised.

Herbal Tea

Herbal teas such as ginger, peppermint, and fennel were rated 8 out of 10. Dr Sethi explained that these teas support digestion and help reduce bloating, making them especially useful after meals or during periods of digestive discomfort.

Kefir

Kefir also received an 8 out of 10. Rich in probiotics and protein, it supports gut health effectively when chosen wisely. Dr Sethi stressed the importance of opting for unsweetened varieties, as added sugars can undo its digestive benefits. Gastro doctor Dr Pal highlighted kefir as a gut-friendly powerhouse, rich in probiotics that introduce beneficial bacteria and yeast into the digestive system. Packed with strains like bifidobacteria and lactobacillus, kefir undergoes fermentation that boosts its probiotic content beyond regular yoghurt. He also noted its nutrients—calcium, protein, and vitamin B12—contribute to overall digestive and gut health.

Water

Water topped the list with a perfect 10 out of 10. Dr Sethi called it essential for digestion, metabolism, and sustained energy. He emphasised that no beverage can replace water’s foundational role in keeping the gut and body functioning smoothly.

Unsweetened Milk

Unsweetened milk was given a moderate score of 6 out of 10. While it provides protein and calcium, Dr Sethi pointed out that tolerance varies widely. He noted that nearly two-thirds of the global population is lactose intolerant, which can make milk problematic for many people.

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Coconut water

Coconut water earned a 7 out of 10. Dr Sethi acknowledged its natural electrolytes and hydration benefits but reminded viewers that it still contains sugar and should be consumed in moderation.

Fruit juice

Fruit juice fell to 4 out of 10. Despite being natural, Dr Sethi explained that most fruit juices lack fibre and can spike blood sugar levels, which negatively affects gut health.

Diet soda

Diet soda scored only 3 out of 10. While calorie-free, Dr Sethi warned that artificial sweeteners may disrupt the gut microbiome, making these drinks far less harmless than they appear.

Sugary/energy drinks

Sugary drinks and energy drinks ranked at the bottom with 1 out of 10. Dr Sethi described them as high in sugar with zero gut benefits, adding that regular consumption can actively harm digestive health.