Entering a calorie surplus is a great way to build muscle. Even though, this is an effective way to build muscle. This doesn't mean that a calorie surplus is required to build muscle. If you just enter a calorie surplus without implementing resistance training. You entering this surplus will just be a waste of time, and instead of building muscle you'll gain unwanted fat. Now you can expect to see a increase of fat when increasing calories. If you don't want to gain much fat you should eat mainly whole foods. Instead of just creating a surplus by adding some unhealthy processed food. Since whole foods with high amounts of protein will make you fuller than if you ate a burger.
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