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you should advice Zachary to: eat energy-dense snacks between meals

In order to gain weight, we need to consume more calories that we usually burn per day. Energy dense snacks tend have a high concentration of calories per serving without making us feel full due to their high concentration in fiber.  example of energy-dense snacks would be Peanut or Wheat cookies.
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In order to add more weight it is advisable to eat food reach in calories. Since it is hard consuming a lot of food at a ago, one is normally advised to consume a small amount of food at regular intervals. Food reach in calories are mainly cereals such as peanuts, soya and products made from milk. 

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