This is a new addition to Eat This Much. We previously just had the option to favorite foods (with a "heart" icon), but we've replaced this with the thumbs up icon to like a food.
So when you see a recipe or food you like, give it a thumbs up!
If you see a recipe you don't like, click the 3-dot menu at the top right when viewing that food or recipe's details page and select the "Block" button. We'll then avoid showing it to you again in the future.
As more people rate foods and recipes, we'll be able to more intelligently suggest recipes based on what other people like with similar tastes.
Also, if you see a recipe you want to see a lot more, add it as a Recurring Food (with the "pin" icon). This gives you control over what recipes show up, and how often.