A few years ago I was on Scarlet (the yacht of @Sarah Brown and @Zoë O'Connell ) and noticed mid morning that I didn't have the bloating sensation I was used to having some time after breakfast. The reason for this, of course, is that Scarlet runs on lactose-free milk. Evidently I was slightly lactose intolerant, started buying lactose-free milk at home, and everything was better.

It shouldn't have been only today that I extrapolated this experience to cover a large takeaway banana milkshake.