Gut health and microbiota
With age, the diversity of the gut microbiota decreases, which can affect digestion, immunity, and cognition. Bananas are a source of prebiotic fibers (inulin, resistant starch) that nourish beneficial bacteria [citation:9].
Feeding the “good” bacteria : The prebiotic fibers in bananas serve as a substrate for beneficial bacteria, promoting their growth and contributing to a stable intestinal environment [citation:9].
Reduction of oral bacteria : A 2024 study showed that consuming two bananas daily for two weeks significantly reduced urinary indoxyl sulfate levels (a marker of the intestinal environment) and, in people with high initial levels, decreased the prevalence of oral bacteria (including Porphyromonas spp.) in the gut microbiota [citation:4].
Digestive regularity : Soluble fibers add bulk to stools and help prevent constipation, a common problem among seniors [citation:9][citation:13].
Sleep and well-being
Sleep disorders are common after age 60. Bananas contain tryptophan and melatonin, precursors to serotonin and melatonin, which are involved in regulating sleep.
Improvement of sleep disorders : An experimental study involving elderly people showed that consuming 260 g of banana per day for 14 days significantly reduced sleep disorders (a decrease of 2.5 points on the insomnia scale). The researchers suggest that bananas can be considered a dietary supplement to reduce sleep disorders in seniors [citation:15].
Blood sugar: pay attention to the degree of ripeness
Bananas are a carbohydrate-rich fruit, with a glycemic index (GI) of approximately 48 for a ripe banana [citation:8]. Therefore, they can influence blood sugar levels, which is important for elderly people with diabetes or prediabetes.
Less ripe bananas, better control : Green bananas contain resistant starch, which slows digestion and attenuates the glycemic response [citation:8][citation:12]. A meta-analysis of clinical trials showed that supplementation with 30 to 40 g of resistant starch from green bananas in obese patients with type 2 diabetes reduced fasting blood glucose, insulin, and insulin resistance [citation:8].
Practical advice : For a person with diabetes, it is recommended to consume a banana that is still slightly green, in a moderate portion (half or a small banana), and to combine it with a source of protein or fat (yogurt, peanut butter) to reduce the glycemic response [citation:8][citation:12].
Signs not to ignore
Despite its benefits, bananas can cause or worsen certain symptoms in sensitive individuals.
Hyperkalemia : In cases of kidney failure or treatment with certain medications (diuretics, ACE inhibitors, beta-blockers), blood potassium levels can reach dangerous levels. Possible symptoms: muscle weakness, palpitations, nausea [citation:14].
Allergic reactions : People allergic to latex may experience cross-reactions with bananas (hives, swelling, difficulty breathing) [citation:5].
Digestive problems : bloating, flatulence, diarrhea in case of excessive consumption of fiber or fructose.
When should you consult a doctor?
