Weight gain shakes: Gaining weight is a dream for those who are lean and if you are one of them prefer protein weight gain shakes. They gain weight in the form of muscle mass and with these shakes if you do resistance exercises the effect will sound more perfect. In supermarkets, whey and casein protein powders are available you can buy and consume them with milk, dry fruits, and spices such as cinnamon or nutmeg.  You need to eat more calories than you burn. Rapid weight may cause many health issues so try for slow weight gain. For slow weight gain, consume 300-500 calories in a day. 5- Affordable Weight Gain Shakes/ Smoothies These 5 smoothies have a lot of health benefits and provide the…