A quick way to measure body fat/muscle mass for each body compartment is by using those commercial health scale.. Just purposely go to a commercial gym (should have one) and say u wanna take up their trial. they will intro you to the gym and let you assess ur body composition and print out the report for u free.. after a month or so just try at another gym for benchmarking again.
@Armesh I once gained 9kg when beginner stage in 3 months, out of it ~6kg were muscles and was taking mass gainer. And i have fortnightly report to track the progress. its possible at early stages
Normally those who have no problem gaining weight from eating everyday food will not understand how difficult it to be a skinny ectomorph who just can't cramp enough food into their small stomachs.
There's always a place for Weight Gainers/Mass Gainers in the life of an Skinny underweight person. They need all the help they can get in addition to their regular food. It provides high calories at inconvenient time and place.
I'm an skinny small boned ecto who's been 55KG for since 14 and never seem to gain weigth. All i did was count calorie, eat 300 cal sulrprus... now after 4 months i'm 62 KG. All just basic maths.
About stuffing food, i just add some olive oil to my food. Whey protein is normally used due to it's fast digesting properties and it's highest quality protein.
The problem is people don't know what are Mass Gainers... for their brains Mass=Muscle. And when they end up gaining 5kg in 2 months, they think it's muscle like the case seen in previous post in this thread.