How to get iphone to stop capitalizing certain words

I know how to get my iPhone to stop correcting spelling for certain words, but how about capitalization? I am a nutritionist and often try to type "whole foods," but my iPhone keeps capitalizing it to "Whole Foods" as if I'm talking about the store.

When suggestions pop up above the keyboard, I often tap the lower-case version in quotation marks (if it's there), but my iPhone still doesn't learn it. I have tried adding the lower-case "whole foods" to keyboard dictionary but it's not very reliable; it often capitalizes anyway. Is there another way besides simply turning off auto-capitalization?