Au contraire, the enzyme pepsin requires an acidic environment in order to digest protein, Apple cider vinegar helps it do it's job.

Whereas Amylase, the enzyme for starch requires an alkaline environment the basis of Food Combining or Fit for life which also has something to say about digesting fat (don't mix with protein).

The best thing I can recommend for help with fat is Oolong Tea which breaks up fat just like soap.