No, it’s just that amateur cyclists swear by bananas. Starch, potassium, biodegradable wrapper. Jerseys have handy pockets that can carry several. Walkers and runners often don’t.
High in pectin. Soluble and insoluble fiber behave differently and I used to be able to explain it somewhat but my brain has been too full of other things lately and I don’t think I can do it justice.