Being on PPIs long term can lead to deficiencies in some vitamins and minerals, particularly iron and B12, I would hope one of your regular reviews would include blood tests to keep an eye on things.
'The power of accurate observation .... is commonly called cynicism by those that have not got it.
George Bernard Shaw'
Killi, 80mg seems a very high dose. Just checked mine and it's only 15mg a day now, I was on 20mg before I asked my GP if I could try the lower dose as I too, was worried about the long term aspects of PPI's. I just have acid reflux though and it may be that your condition is worse than mine. I do voluntary control how much fat I eat in a day, which is a good thing as it cuts down on chocolate and cake!
Thanks for the heads up @killi, let's hope we'll both live to a grand old age!