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Headers are essentially metadata and you need some way to indicate that they are separate from your content, but related to it. I would recommend against lowercase and normal weight text as it will make that row visually similar to the rest of the content. Title case is the most common, though you might be able to use small caps or uppercase headers. However, these are often less aesthetically pleasing.
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.