H2O

Ever had an amazing workout one day and the next morning you step on a scale and it reads over what it had been the day before? Don't freak out people! This is because when you get an anaerobic workout (weights, ploys) your muscles are literally tearing to build fibers, so in order to recoup they need hydration and they hold the water that you put into your body. It's about the same effect that salt does, but for a good reason:). So unless you figured that since you had a great workout you could indulge in a cake, it's just water retention in your muscles! Give it a day or two and then check out the results. It should be the same or less if your diet was the same or better. Also note that the numbers on the scale aren't the way to track progress. Built up stamina, endurance and how your clothes fit are the essential tool to use and listen to for self betterment tracking.