the ideal place to begin is usually to eyeball prime-rating pages for commonalities. For example, the 3 major-ranking pages for “paleo diet” all talk about foods to take in. That tells us this is probably a thing https://www.upwork.com/services/product/marketing-rank-your-website-first-page-of-google-monthly-seo-service-1505112383555256320?ref=project_share