The theory is that alkalinizing your body (i.e. making it less acidic or raising the pH) creates a less appealing environment for this new coronavirus.
Well, it doesn’t. You cannot – and you don’t want to – change the pH of the cells in your body by anything you eat or drink. Your body must tightly regulate the acidity of your blood and cells and will do so at any cost.
When it starts to fail at this, your body begins to fail. It’s not consistent with life. There’s no evidence – and it’s even contrary to medical science – that attempting to alkalinize your body through lemon juice or any other means does anything for coronavirus. And biologically speaking, it’s simply nonsense.