Jacob Anderson on Instagram: "Twenty grams of protein from peanut butter comes with roughly 575 calories. Chicken breast? Roughly 95 calories. Big difference? Here’s a simple rule to tell if something is a good protein source: Take the protein number per serving, add a zero, and see if that number is higher than the calories in that serving. If it is, it’s a solid source of protein. Example: Chicken breast has 20 grams of protein. Add a zero — 200. 200 is higher than 95 calories, so that’s an ex