This is a major operation in a high-risk population.

That is significantly higher than most people expect when they think of obesity surgery. Patients are at higher risk for having bad things happen after surgery because of their advanced age or other conditions.

This is not a vanity operation, it's a high-risk operation. This at least allows people who are considering this surgery to go in a little bit more with their eyes open.

Statistically then, the risk is approximately 1 in 1,000, which is substantially higher than in the normal population. We're also careful to say we do not know what the risk is for individuals with long-term use of the drug.

The risk to the general population is very low.

We have, after all, an ageing population, and dementia is generally a condition of ageing, in that the risk increases with age.