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Clarification as requested by John Gregory, Newsguard - February 27, 2019
The study in reference 15 also concluded that out of four different cooking methods for broccoli: high pressure boiling, low pressure boiling, microwaving and steaming – steaming preserves the greatest amount of phenolic compounds. The study on garlic in reference 16 also concluded that various methods of heating damage the anticancer ability of garlic, but when garlic is crushed or cut and allowed to sit at room temperature for 10 minutes before heating, it can still maintain some protective properties.