Yes. DASH diet books focus on explaining the theory behind their formula, which is something you can use to make better food choices at restaurants. While you can’t micromanage the chef, the book can empower you to make necessary substitutions in the meals you order. It’s as simple as asking the kitchen to hold the salt, use low-fat milk, or switch fries for vegetables. With that said, the DASH diet advocates moderation and enjoying life, so the books also explain why it’s okay to stray off the diet and enjoy treats occasionally.