I think bread is acidic, but wheatgrass juice is called the king of alkalizers. Sprouted wheatgrass is highly nutritious & alkaline, too. After 3 days of sprouting it has tons of nutrition in it, but even one day is good too. It tastes kind of like chewy bread dough, & I add Seasalt to it personally.
No doubt parasites prefer an acidic body, however, I would not just use alkalizing to get rid of them. Sadly, if you are like the general population, you probably already have a bunch of them ingrained in your system.
The right herbals & zappers are a sure thing for killing them. So far I've never heard of anyone getting rid of them simply by alkalilzing, though alkalizing is great!