bingo. lemon, lime, and all other citrus fruits are the opposite of alkaline. wine is highly acidic, processed tomatos (sauce, ketchup), and the worst of all vinegar.... which is in a ton of things.
and youre right, your body maintains its state of pH no matter what. the biggest issue with pH is its role in acid reflux, (or even pepsin, free radicals,) etc. its not just highly acidic food but processed and preservatives. there are a number of issues you would never know related to acid traveling back up into the esophagus and throat.
anyone interested in learning more should read this book. You dont have to do any 28 day program he just suggests a routine if you want. its very eye opening and written by a top doc right in nyc. ive met him. those that want to push pills would say it borders pseudoscience but this guy treats patients with medicine AND diet plans. strange that 90% of the GI docs never once talk about diet when its literally what is shoved down there day in and day out. at the very least youll def lose weight and be healthy even if you dont believe in it.