The Top 5 Most Alkaline Foods: Spinach, Kale, Cucumber, Avocado, & Broccoli. Click on the image above to learn more about alkaline foods and how our understanding of Blood pH can help us prevent cancer. Ty Bollinger states, "The general rule of thumb is to eat 20% acid foods and 80% alkaline foods." Click through as he also talks about some excellent alkaline-forming foods. Please re-pin. Together we can educate the world about healthy lifestyle!