I had a urinary tract infection, and the doctor practically commanded me to get on antibiotics. When I told him I would rather use a natural means to combat it, he told me that if I do not get on antibiotics, the type of infection I have could put me in the hospital.
IMO your doctor was correct. Once someone has a bladder infection, the normal way for it to be treated is with antibiotics.
As you say there may be other reasons why some people are more prone to develop a bladder infection in the first place.
I know you probably understand most of this but just in case it isn't clear to anyone else reading.
The controversy is about people mistakenly thinking it is effective as a treatment once one has an infection. It is not, it only at best reduces likelihood in some people of an infection occuring, or re-occuring.
The thing to get clear is that cranberry juice doesn't
treat (relieve symptoms of ) cystitis, neither is it a cure as if drinking a bottle of it would mean you never got a bladder infection again. The distinction is that as a natural means it
may have some
preventative value (according to some, but not all studies).
Cranberry supplementation in the prevention of non-severe lower urinary tract infections: a pilot study - PubMed
The disparity in studies may be due to the fact that some cranberry juice products are cocktails (such as some summer fruits cordials. And even while they are labeled as Cranberry Juice some products are four juice blends - so check the label), and as such may not contain very much real cranberry juice. Its not clear to me which products have been trialed.
Another thing to bear in mind is that cranberry juice may interact with some medications, for instance blood thinners, so checking with ones doctor first is not a bad thing.
But as far as bladder infections it is not perfectly preventative. It has to be taken like everything else in moderation. If in spite of taking it one does develop a bladder infection, then that has to be treated medically, usually with antibiotics, not by continuing to drink or increase one's intake of cranberry juice.
The theory is no more than that in the case of bladder infections, it may reduce
likelihood of an infection occuring. If some people make it out to be a cure once you have an infection, they are incorrect about why health food advocates recommend it. Cranberries, and cranberry juice unless one has some inability to take it, is a source of vitamin C also.
Also bear in mind some juice products are concentrate and need diluted.
Sorry for this being off-topic, but since the topic was broached briefly earlier in the thread, I wanted to add some qualifying remarks to my earlier comment about its efficacy.