How to Gain Weight in a Healthy Way
What Finally Helped Me Gain Muscle, Appetite, and Size
For years, I was naturally very lean and found it frustratingly difficult to gain muscle and body weight.
Tall. Lean. Perhaps a little too lean. Always hearing things like, "You can eat anything and never gain weight" or "You're so lucky."
If you've struggled to put on weight, you'll know there is nothing particularly lucky about it. It can be just as frustrating to gain weight as it is for some people to lose it.
What finally changed things for me was understanding one simple truth:
If you want to gain weight, you need to consistently eat more calories than your body burns.
Not for three days.
Not for a week.
For months.
It sounds obvious, but putting it into practice can be surprisingly difficult. It certainly was for me.
Once I improved my eating habits, added structured strength training, prioritised sleep and recovery, and reduced a few habits that were suppressing my appetite, things finally started to change.
The result was gradual but noticeable: more muscle, a better appetite, increased strength, and a healthier body weight that I could actually maintain.
If you're looking for personalised support, I also offer sports nutrition coaching in Barcelona and online, helping clients improve performance, recovery, body composition, and muscle gain through evidence-based nutrition strategies.
Healthy Weight Gain Is About Muscle
The goal is not simply “gain weight.”
The healthier goal is:
build muscle
improve strength
support recovery
increase energy
feel stronger physically and mentally
This is why resistance training matters.
Bodyweight training like calisthenics, lifting weights in the gym or Cross Fit gives your body a reason to use extra calories and protein to build lean mass instead of simply storing fat. And it also helps with increasing appetite. On training days, I was able to eat double or triple without effort.
Choose a type of exercise you actually enjoy. Train consistently at least 3-4 times per week. A session doesnt have to be 2h each time. 45-60 minutes combined with the weight gain diet will get you the results!
Most Skinny People Undereat
This is usually the real issue. It certainly was for me. I felt more comfortable in the fasted stage. And one of my philosophies I live by is “to eat to live not live to eat“.
Many naturally skinny people:
skip meals
rely on coffee
eat inconsistently
underestimate calories
move constantly
struggle with appetite
A protein shake and one large lunch is not enough for weight gain.
Eat More Without Feeling Overly Full
There are different strategies such as eating bigger meals, adding extra meals or a combination of the two.
Then what also helps is to add smarter calories.
Easy calorie-dense foods
nut butters
olive oil
avocado
full-fat Greek yogurt
nuts and trail mix
cheese
granola
hummus
dark chocolate, especially in the evenings
A few extra calorie-dense foods daily can make a consistent difference over time.
➟ If bloating makes it difficult to eat enough or feel comfortable after meals, read my article on bloating, digestion, and common gut triggers.
Calorie Counting Is Helpful at the Start of a Weight Gain Journey
To gain weight, you need to consistently consume more calories than your body burns. Your daily calorie needs are made up of your basal metabolic rate (BMR), which is the energy required to keep you alive at rest, plus calories burned through daily activities, exercise, digestion, and movement throughout the day. For many active adults, total daily energy expenditure (TDEE) falls somewhere between 2,000 and 3,000+ calories per day, depending on factors such as age, sex, body size, muscle mass, and activity level.
Aiming for a daily surplus of around 350-500 calories is a sensible starting point for most people. For example, if your body requires 2,500 calories per day to maintain its current weight, consuming around 2,850-3,000 calories per day would typically support gradual weight gain.
You can use free tools such as Cronometer or MyFitnessPal to track your daily calorie intake. I suggest doing this for at least the first 2-3 months. Once you understand what it takes to consistently achieve a calorie surplus, it usually becomes unnecessary to continue logging every meal.
Meal Planning Makes Weight Gain Easier
One thing that helped me massively was having food ready before I was hungry.
If you naturally struggle with appetite, waiting too long to eat often leads to under-eating overall.
Meal prep removes friction and makes consistency easier.
Simple foods to prepare in bulk
rice or potatoes
chicken or mince
overnight oats
sweet potatos
smoothies
boiled eggs
Greek yogurt bowls
trail mix
Small calorie additions also help:
olive oil
nut butters
avocado
honey or dates
Many naturally skinny people do better with structure:
breakfast
lunch
snack
dinner
evening smoothie
Once eating becomes routine, appetite often improves too.
Liquid Calories Help
A homemade smoothie can easily add 600-1,000 calories and is often one of the simplest ways to increase their calorie intake.
Simple weight gain smoothie:
oat milk
banana
oats and or chia seeds
peanut butter
Greek yogurt
honey or 2 medjool dates
protein powder
Easy calories. Easy protein. Easier appetite.
Coffee Can Kill Appetite
This was a major one for me.
For some people, too much coffee reduces hunger and replaces proper meals.
If you struggle to gain weight:
eat breakfast before coffee
avoid replacing meals with caffeine
stop relying on stimulants to push through fatigue
➟ If reflux, burning, or upper digestive discomfort affect your appetite, you may also benefit from reading my article on acid reflux, stomach acid, and digestive health.
Sleep Is Underrated
Poor sleep affects:
recovery
muscle growth
training performance
appetite
hormones
Training builds the stimulus.
Sleep helps build the body. Make sure you sleep 8-9 hours every night at minimum. And consistent sleep routine helps to get there!
Train Properly
You do not need a complicated bodybuilding programme to build muscle.
If you are new to resistance training, consider working with a qualified personal trainer to establish a sustainable training plan, learn proper technique, and ensure consistent progression over time.
Focus on the basics:
Squats
Rows
Presses
Pull-ups
Deadlifts
Consistency
The specific exercises matter less than showing up regularly and gradually challenging your muscles over time.
Trying to gain weight without resistance training often leads to disappointment, as much of the extra weight gained is more likely to be body fat rather than lean muscle mass.
Learn to Enjoy Eating More
This was the mindset shift that changed things for me.
For years, eating felt like a task.
What helped:
training hard enough to feel hungry
building routines
eating socially
removing guilt around eating more
understanding that food supports recovery and performance
Once eating becomes part of feeling stronger, it gets easier.
Meal Ideas for Healthy Weight Gain
To gain weight, focus on meals that combine quality protein, complex carbohydrates, and healthy fats. The easiest way to increase calories is often by adding foods such as olive oil, avocado, nuts, seeds, nut butters, full-fat dairy, and dried fruit to meals you already enjoy.
Breakfast
Oats with whole milk, banana, nuts, seeds, and nut butter
Eggs with avocado and buttered toast
High-calorie smoothie with milk, oats, banana, nut butter, and protein powder
Lunch
Chicken, rice, avocado, and olive oil
Tuna, quinoa, beans, and olive oil dressing
Loaded bagel or sandwich with eggs, cheese, and avocado
Dinner
Steak, sweet potato, and vegetables
Salmon, rice, and avocado
Pasta with pesto, parmesan, and chicken
Snacks
Mixed nuts and seeds
Nut butter on toast
Greek yoghurt with honey
Trail mix with dried fruit
Final Thoughts
There is no magic mass gainer.
No secret shortcut.
The basics still work:
eat more consistently
prioritize sleep
train with resistance
choose calorie-dense foods
reduce appetite-suppressing habits
focus on muscle, not just scale weight
For naturally skinny people, the answer is often simple:
eat more. consistently.
Need Help Gaining Weight and Building Muscle?
If you’ve struggled to gain weight despite eating “a lot,” I understand how frustrating that can feel.
I help clients build realistic nutrition, training, and lifestyle habits that support:
healthy weight gain
muscle growth
better appetite
energy and recovery
You can book a free 15-minute call or message me directly on WhatsApp to discuss your goals.
Frequently Asked Questions
Why can’t I gain weight even though I eat a lot?
Many naturally skinny people overestimate how much they actually eat. Skipping meals, relying on coffee, inconsistent eating, stress, high daily movement, and low appetite can all make it difficult to maintain a calorie surplus consistently.
What foods are best for healthy weight gain?
Focus on calorie-dense whole foods such as nut butters, olive oil, avocado, full-fat Greek yogurt, nuts, cheese, oats, hummus, eggs, rice, potatoes, and smoothies. Liquid calories can also help if you struggle with appetite.
Can coffee affect appetite and weight gain?
Yes. For some people, excessive coffee or caffeine intake reduces hunger and replaces proper meals. If you struggle to gain weight, eating before coffee may help improve appetite and calorie intake.
Is it possible to gain weight without going to the gym?
Yes, but resistance training helps ensure that more of the weight gained comes from lean muscle mass rather than only body fat. Even two to three strength sessions per week can make a major difference.
How important is sleep for muscle gain?
Sleep is essential for recovery, muscle growth, hormone balance, and training performance. Most adults trying to build muscle should aim for around 7 to 9 hours of consistent sleep per night.
References & Evidence
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Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults.
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