Gaining weight sounds simple on paper - just eat more. In reality, it’s often much harder, especially if you’re trying to gain muscle rather than just body fat.
A lot of people who struggle to gain weight fall into the same traps. They train hard, eat what they think is “a lot”, but still don’t see the scale move. Usually, the issue isn’t effort - it’s approach.
If you get a few key fundamentals right, though, weight gain becomes much more predictable.
Start With Calories - The Foundation of Weight Gain
Before worrying about supplements or even protein, the most important factor is total calorie intake.
To gain weight, you need to be in a calorie surplus. That means consistently eating more calories than your body burns each day.
For most people, a good starting point is:
- Around 300 to 500 calories above maintenance
If you’re not gaining weight after a couple of weeks, that usually means you’re still not eating enough - even if it feels like you are.
This is where many people go wrong. Appetite can be a limiting factor, especially if you naturally have a fast metabolism or a busy lifestyle.
Protein - Supporting Muscle Growth (Not Just Weight Gain)
Calories drive weight gain, but protein determines what type of weight you gain.
Without enough protein, a larger portion of the weight you gain is likely to be fat. With sufficient protein, you give your body the building blocks it needs to support muscle growth alongside your training.
A practical target for most people is:
- Around 1.6 to 2.2 grams of protein per kilogram of body weight per day
You don’t need to obsess over exact numbers, but you do want to be in that general range consistently.
Another factor that often gets overlooked is how protein is distributed throughout the day. Getting a decent amount in each meal or shake tends to be more effective than trying to consume most of it in one go.
If you’re unsure how much protein to aim for per serving, this guide on whey protein serving size explains how to structure your intake based on your goals and body weight.
Making It Practical - Eating Enough Without Overthinking It
In theory, gaining weight is just about eating more. In practice, it’s about doing that consistently without it becoming a chore.
Some simple ways to increase calorie intake without forcing huge meals include:
- Adding calorie-dense foods like nuts, oils and nut butters
- Drinking calories (smoothies, shakes) instead of relying only on solid food
- Eating more frequently throughout the day
These small adjustments can make a big difference over time.
Weight Gain Supplements - Where They Actually Fit
Supplements can be useful when you’re struggling to hit your calorie and protein targets, but they shouldn’t be the starting point.
Think of them as a tool to make things easier, not a shortcut.
Mass Gainers
Mass gainers such as Mutant Mass and Mutant Mass Extreme are designed to provide a high number of calories in a convenient form. They typically combine carbohydrates, protein, and sometimes added fats.
They can be especially useful if:
- You have a low appetite
- You struggle to eat enough during the day
- You need something quick post-workout
Products like Critical Mass are popular because they make it much easier to add several hundred calories without having to prepare large meals.
Whey Protein
Whey protein isn’t a weight gain supplement on its own, but it plays an important role in helping you reach your daily protein target.
It’s particularly useful:
- After training
- Between meals
- When you don’t have time for whole food
At The Supplement Store we stock many different popular whey protein supplements such as Per4m Whey, which mix well and taste great while offering a super convenient way to reach your daily protein target.
Creatine
Creatine is one of the most researched and widely used supplements in the fitness industry, and for good reason. While it doesn’t directly contribute calories like mass gainers, it can play an important role in supporting muscle growth over time.
Creatine supplements work by helping your muscles produce more energy during high-intensity exercise. This can lead to improvements in strength, training performance and overall workout quality, all of which contribute to better muscle gain when combined with a calorie surplus.
Over time, this increased training output can make a noticeable difference. Being able to lift slightly heavier weights or complete more reps consistently can add up to greater progress across weeks and months.
Another benefit of creatine is that it can increase water content within muscle cells. This can give muscles a slightly fuller appearance and may also support the muscle-building process itself.
Creatine is typically taken daily, with most people using around 3 to 5 grams per day. It doesn’t need to be timed precisely, although many people choose to take it around their workouts out of convenience.
While it won’t directly increase your calorie intake, creatine can be a useful addition to a weight gain plan by helping you train more effectively and get more out of your workouts.
This is one of the reasons creatine is often included alongside weight gain plans, as it supports the type of training needed to build muscle effectively.
Weight Training - Turning Calories Into Muscle
Nutrition provides the building blocks for weight gain, but training is what determines whether that weight becomes muscle.
If your goal is to build size rather than just gain body fat, resistance training needs to be a consistent part of your routine. Lifting weights creates the stimulus your body needs to grow, giving those extra calories and protein a purpose.
A key principle to focus on is progressive overload. This simply means gradually increasing the demands placed on your muscles over time. In practice, that could involve:
- Increasing the weight you lift
- Performing more repetitions
- Adding extra sets
- Improving control and technique
You don’t need to overhaul your training every week, but you should aim to make steady progress over time. Small improvements, repeated consistently, are what lead to noticeable muscle gain.
At the same time, more isn’t always better. Training too frequently or with excessive volume can limit recovery, especially when you’re also trying to increase your calorie intake.
A balanced approach works best:
- Train each muscle group 2 to 3 times per week
- Focus on compound movements like squats, presses and rows
- Allow enough recovery between sessions
When your training, nutrition and recovery are aligned, your body is in the best possible position to turn a calorie surplus into lean muscle rather than unnecessary fat gain.
This is also where your protein intake becomes even more important, as your body needs those nutrients to repair and build muscle following each session.
Common Mistakes When Trying to Gain Weight
1. Not eating enough consistently
This is by far the biggest one. A couple of high-calorie days won’t make up for a week of under-eating.
2. Relying too heavily on supplements
Mass gainers help, but they can’t replace a solid diet.
3. Ignoring protein intake
Calories matter, but protein determines how much of that weight is muscle.
4. Expecting results too quickly
Weight gain, especially lean muscle, takes time. Consistency is more important than speed. A slower rate of weight gain also usually means a better ratio of muscle to fat gain whereas very rapid weight gain almost always results in a high level of fat accumulation.
Final Thoughts
Gaining weight and building muscle isn’t complicated, but it does require consistency.
Focus on:
- Maintaining a calorie surplus
- Getting enough protein each day
- Using supplements to support your intake where needed
Get those basics right, and the results will follow over time.
Frequently Asked Questions
How long does it take to gain weight?
Most people can expect to gain around 0.25 to 0.5kg per week with a consistent calorie surplus.
Do I need supplements to gain weight?
No, but they can make it easier to hit your calorie and protein targets.
Can you gain muscle without gaining fat?
Some fat gain is usually unavoidable, but a controlled calorie surplus and proper training can minimise it.
