Feeling light hunger constantly is not ideal, to gain muscle your body must have the necessary calories to not only sustain itself, but grow muscle and sustain those muscles. A diet comprising of starchy foods can satisfy this. Eating lots of beans which are generally higher in caloric density will also do this and is a good approach. It may be hard while on the go to eat which I am assuming is why you have a light hunger. There are options. You can have snacks, such as hummus sandwiches on whole wheat bread, larabars or even small meals prepared at home.
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To increase insulin output, a high carbohydrate intake is necessary. The perfect time to consume more than your normal carb intake is just before, and directly after, training. Around 50 grams before and 60-70 grams after your workout of rapidly absorbed carbs such as waxy maize (place relevant ALLMAX product here) (a period when your muscles will, respectively, use them to fuel tough training and where they will more rapidly be transported, along with proteins, to hungry muscles) may work for a 200lb person (scale up or down accordingly). By contrast, keep your carbs comparatively moderate for the remainder of the day to maintain low insulin levels, to minimize fat storage.