Skinny guys often say they can eat anything they want without gaining  weight. They think they’re blessed with a fast metabolism. They’ll  say: “I make women jealous with my metabolism. I can eat junk food  all day without gaining weight”.
 Truth is you can eat anything you want without gaining weight because  you’re not eating a lot. I know you think you do, but you’re not.  Otherwise you wouldn’t be skinny. Here’s how to gain weight for skinny  guys.
 
1. Track Calories. Skinny guys often overestimate what they  eat. Read the labels, use a food  scale and track your daily caloric intake using FitDay.  You need at least your body-weight in lbs x 20kcal daily to gain  weight.
 
2. Set a Goal Weight. A rule of thumb is at least 1kg for  each cm above 1m (use this  converter). Anything less you’ll always look skinny. There’s no upper  limit, if you want to weigh more go for it. Examples of minimum goal  weights:
 - 1m70/5′7″ at least 70kg/154lbs
 - 1m75/5′9″ at least 75kg/165lbs
 - 1m80/5′11″ at least 80kg/176lbs
 - 1m85/6′1″ at least 85kg/187lbs
 - 1m90/6′3″ at least 90kg/200lbs
 
 
3. Eat Every 3 Hours. You need at least your body-weight in lbs  x 20 kcal to gain weight. That’s 2700kcal/day if you’re 135lbs. If you  have a physical job or move a lot, you’ll need even more. Eat every 3  hours.
 - Breakfast. Get calories from the first hour. Read  how to build  the habit of eating breakfast and try these breakfast  recipes.
 - Lunch & Diner. Prepare double portions while  making breakfast. 1 portion for work/school, 1 portion when you get  back.
 - Snacks. Mixed nuts, fruits, dried fruits, yogurt,  cottage cheese, eggs, sandwiches, milk, protein shakes, …
 - Post Workout. Physical activities burn calories.  Eat post workout to get that energy back. Check this post  workout shake recipe.
 
 
4. Eat Calorie Dense Foods. 100g raw rice is 380kcals. 100g raw  spinach is only 25kcals. Getting your daily calorie intake is easier if  you eat foods high in calories. Your best options:
 - Pasta. 100g pasta is 380kcal and easier to ingest  than 100g rice. Whole grain pasta is healthier, but  takes longer to  digest. Eat white pasta.
 - Whole Milk. If you don’t bother gaining some fat,  drink 1 gallon whole milk per day on top of your current food intake.  I’ve seen guys gaining 60lbs/year drinking 1 gallon per milk per day  while Squatting  3x/week.
 - Nuts. Mixed nuts & natural peanut butter have  +500kcal/100g, about 50% healthy fats and 25% protein. Use mixed nuts as  snack & throw peanut butter on sandwiches for work/school.
 - Olive Oil. Protects against heart diseases &  cancer. Sip it like vodka (it’s not that bad, really) or use it for  tomato pasta sauce. 1tbsp is 100kcal.
 
 
5. Get Stronger. You want to go from skinny to muscular, not  from skinny to chubby. Get into strength  training. More strength is more muscle. If you don’t know where to  start, check StrongLifts  5×5. Some tips.
 - Free Weights. Force you to stabilize the weight and  allow for natural motions. Start light, focus on technique and add  weight progressively.
 - Compound Exercises. Do exercises that work your  whole body. Squats,  Deadlifts,  Overhead  Press, Bench  Press, Pull-ups,  Dips,  Barbell  Row, …
 - Squat. Leg exercise stressing your whole body. When  you can Squat  1.5x your body-weight for 1 rep, you’ll no longer be skinny. Squat  often.
 - Rest. Muscle grow when you rest, not when you  workout. Don’t train daily. Sleep, drink 1 gallon water daily and eat  fruits/veggies.
 
 
6. Eat Protein. You need 1g protein per pound of body-weight  per day to build  & maintain muscle. If you weigh 150lbs/68kg, that’s 150g  protein per day. Eat whole protein with each meal. Sources of protein:
 - Red Meat. Ground round, steaks, deer, buffalo, …
 - Poultry. Chicken breast, whole chicken, turkey,  duck, …
 - Fish. Tuna, salmon, sardines, mackerel, …
 - Eggs. Eat the yolk, it’s full of vitamins.
 - Dairy. Milk, cottage cheese, quark, yogurt, whey,  …
 
 
7. Plan. Failing to plan is planning to fail. You don’t have  time to cook 3x/day, and the food at work/school is often low  quality/more expensive. Prepare your food in advance and take it with  you.
 - Do The Grocery. Avoid skipped meals because you  don’t have food available. List everything you need for 1 week and go  buy it.
 - Cook in Advance. Prepare all your meals once per  day: while preparing breakfast or while preparing dinner. It takes about  40mins.
 - Keep it Simple. Make double portions, take  leftovers with you, use cans of tuna & mixed nuts, 1 gallon milk per  day, …
 - Take Food with You. Food containers for  work/school, mixed nuts at the movies, eat before going to town, take  protein shakes to the gym, …
 
 
8. Track Progress. Success breeds success. Knowing that you’re  losing your skinny look will keep you motivated. Track everything.
 - Track Calories. Continue tracking your daily  caloric intake using FitDay  so you get a confirmation of how many calories you’re eating.
 - Weigh Yourself Weekly. Gaining weight? Don’t change  anything. Not gaining weight? Increase your daily caloric intake by  500kcal.
 - Take Pictures. The mirror is subjective. Pictures  don’t lie. Shoot pictures bi-monthly so you have objective measurements  of your progress.
 - Track Strength Gains. When you can Squat 1.5x your  body-weight for 1 rep, you’ll no more be skinny. Use the StrongLifts  5×5 spreadsheet.
 
 
Weight Gain Diet. 3500+kcal example diet for a skinny guy who  wants to weigh 180lbs/81kg. This can be too much at once if you’re only  135lbs/61kg or not enough if you’re very active. Individualize the diet  based on your needs.
 - Breakfast: 100g oats, 50g raisins, 1scoop whey
 - Snack: 100g mixed nuts or 1 liter milk or tuna sandwich
 - Lunch: 200g white pasta, bolognese sause, parmesan cheese
 - Snack: 100g mixed nuts or 1 liter milk or tuna sandwich
 - Post workout shake: 1.5scoops whey, 60g oats, milk, banana
 - Dinner: 200g white pasta, bolognese sause, parmesan cheese
 - Pre bed: cottage cheese, berries, flax seed, fish oil.
 
Copy and paste from this emel : http://stronglifts.com/how-to-gain-weight-for-skinny-guys/