Some of my favorite books about food:
Real Food: What to Eat and Why
Animal, Vegetable, Miracle: A Year of Food Life
Food Matters: A Guide to Conscious Eating
Fat: An Appreciation of a Misunderstood Ingredient
It’s not too late: Make your own tasty food gifts
Here are some past post with food as gift ideas:
Homemade Vanilla Extract
Spicy Hot Chocolate Mix
Homemade Maple Marshmallows
Cinnamon Tincture and Liqueur
Homemade Maple Granola
Homemade Crystallized Ginger & Syrup
Spicy Mustard
Pasteli: Sesame Honey Candy
Almond Joy knock-offs
Maple Pralines (without white sugar)
Maple Turtles (without white sugar)
Peanut Butter Cups (no refined sugar)
Nourishing Gourmet, also has a great list of gift ideas!