Mostly plants: Grains, fruit, vegetables, legumes, fill your plate with these foods, and when it comes to meat, dairy and fish, invest in your health and future of the planet by thinking about quality over quantity.
And I would like to add one last one, eat with someone you care about (even if that’s just yourself!) without distractions. How many times have you shovelled down your lunch only to look up from your phone to realize that it’s gone and you can’t even remember what it tasted like? Food is meant to be enjoyed, yet we rarely take the time to appreciate it and all of the hard work that went into getting that food from the earth to our plates.