best fast way to gain weight

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.com. You need at least your body-weight in lbs x 20kcal daily to gain 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 5x5. 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.