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How To Bulk Up Fast | As Proven By Science

How To Bulk Up Fast | As Proven By Science
Alice Pearson
Writer and expert4 years ago
View Alice Pearson's profile

Spring, summer, autumn, and bulking season — that sounds about right, yeah? Well, that’s the case for many fitness enthusiasts, who take advantage of these next few months to pack on some mass and bulk up.

As humans, we generally love food — so most of you should find the ‘eating a hell of a lot of food’ part of bulking rather enjoyable. And yes, if you up your calorie intake without going mad on the cardio, you will put on weight, but is bulking that simple?

Here we’re going to give you some advice on how to bulk the correct way — that is with the goal of maximising muscle gains, whilst minimising fat gains. So, if you thought pizza, chips, and ice cream was on the menu — think again!


In this article, you'll find:

how to bulk up

1. Fuel your workout

Right, imagine you’ve just got into your car to head off on a wonderful adventure. Say this adventure only takes you around the corner — you’ll only need a little bit of fuel to get you there. But what if you’re driving right across the country? Then you’ll need a full tank of fuel to last the journey. Or, if you forgot to fuel up at all, you’ll end up getting out of the car and spending an unadventurous day sulking.

You probably know where we’re going with this — you’re the car, fuel is food, and the journey is your workout. But how should you fuel when bulking?


What should I eat to bulk up fast?

Like we said, just because you’re bulking, it’s not an excuse to over-do it on the junk food – keep it clean for lean gains. We’re talking good quality sources of protein, such as chicken, fish, eggs, and plain yoghurt — these are rich in essential amino acids, which are needed to build new muscle proteins.1

The amino acid which is deemed most important for muscle building is leucine — a branched chain amino acid. Leucine is the best stimulator of the metabolic pathway that leads to the production of new muscle proteins — it’s basically the ‘on switch’.2 It’s recommended that you consume 50 mg per kg of body mass of leucine daily, which can be achieved through dietary sources (chicken, tuna, and tofu are good options) or a supplement (whey protein has the highest leucine content).3

You also need a good amount of carbohydrates to recover properly from your workout. Carbohydrates are mainly stored in the body as muscle glycogen and are the main fuel source used during exercise. After your workout, your muscle glycogen stores need topping back up to make sure you’re ready for the next session — eating carbs is the way to do this.4 Good options include:

  • Whole-wheat pasta
  • Rice
  • Potatoes & sweet potatoes
  • Wholemeal bread
  • Oats
  • Fruit

Fats are the most energy-dense macronutrient, packing in 9 calories per gram — that’s more than twice that of protein and carbs. So, increasing your fat intake is an easy way to get extra calories in and enter an energy surplus. BUT, this also means it’s easy to go overboard and consume too many calories from fats — so portion control is key. Opt for ‘good fats’ (mono- and poly- unsaturated fats) such as:

  • Nuts & nut butters
  • Seeds
  • Avocado
  • Oils
  • Dairy products

Amidst all of this, don’t neglect your micronutrients — vitamins and minerals are essential for overall health, so make sure to eat a variety of fruit and veg.

To find out how much you need of protein, carbohydrates, and fat, check out our macro calculator.

When to eat for bulking?

In order to bulk up and gain lean muscle mass, you need to be in a state of positive nitrogen balance — this is when muscle synthesis (building) is greater than muscle breakdown. To do this, try to eat some protein (about 20 g) every 3-4 hours — key times are with breakfast, post-workout, and before bed.5 This could be made up of three meals, plus a few snacks or shakes in between.

Like we said, carbohydrates are the main energy source you use for day-to-day life, as well as exercise, so ideally you want to be eating carbs throughout the day. Since carbohydrates play a key role in exercise recovery — by replenishing muscle glycogen stores — it’s important to get some carbs in after your session.4 This could be as simple as having a glass of milk, or even better, shake it up with some protein powder and tick off two nutrition goals in one.

Still, be sensible with your carb intake and switch up the quantity depending on how much training you’ve done. If it’s a rest day, you won’t need as many carbs (or total calories) compared to on a heavy training day. As a guide, keep your carb intake around 3 g per kg of body weight on rest or light-training days (that’s about 240 g if you weigh 80 kg, for example) and increase to meet the demands of your training.6

Track your progress and see how your body is responding to the food you’re eating, but remember, bulking isn’t a race.

How to bulk up fast with supplements

Supplements aren’t essential for bulking, but they can help make the process easier for you. They’re convenient for when you’re busy on the go, easy for meeting your requirements, and quick if you can’t be bothered to cook! When it comes to bulking season, here are the best supplements to try:

  • Protein powders – whey, casein, soy, pea etc.
  • Protein bars
  • Creatine
  • Leucine
  • Weight gainers (carbohydrate and protein blends)
  • Caffeine – for a pre-workout boost
how to bulk up

2. Tailor your training for bulking

Now that you’ve got the diet nailed, what about your training? It’s good to mix up your workouts so your body doesn’t get too used to doing the same thing. Giving your muscles a new stimulus by changing the exercise type, intensity, or duration will make them adapt, evolve, and grow.

You know when you train a muscle you forgot you had and the next day it feels on fire? Well you’ll probably notice the next time you train that muscle, it won’t be so sore afterwards — this is due to ‘training adaptations’ and is important during bulking.

With that in mind, here are some exercises that are great to help you bulk up — remember to mix it up:

  • Compound lifts (squats, deadlifts, bench press)
  • Resistance exercises
  • Calisthenics (pull-ups, press-ups, triceps dips etc.)
  • HIIT (high intensity interval training)
  • Steady-state cardio

Yes, you heard it right. Cardio is important for maintaining cardiovascular health and overall fitness, so even when you’re bulking, you should fit in a few sessions a week. Don’t go too crazy though – cardio can burn a lot of calories, so make sure you fuel up well)

3. Recover properly

You may be thinking “the more you train, the more you gain”, but this is a great misconception. In fact, failing to recover properly from your workouts or ‘overtraining’ could actually hinder the bulking process.

When you perform resistance training, your muscle fibres are damaged — they stretch, tear, and are broken down. It’s during the recovery process that your muscles repair and re-build — growing bigger and stronger — making exercise recovery a key part of bulking successfully.7

Most of us associate bulking with lifting heavier weights or performing more reps. Overall tougher sessions to drive your muscles to grow. Well, poor recovery could stop you from doing this.

In a study of resistance-trained males, none of them were able to achieve their 10 rep max (maximum weight lifted for 10 reps) across 8 exercises after only 24 hours of recovery. Even after 4 days of rest, only 80% of participants could hit their 10 RM.8

Give yourself a few days of rest before training the same muscle group to reap the full bulking benefits of the session. Plus, you put yourself at greater risk of injury, so don’t push too hard too soon.

Of course, don’t forget nutrition — you want to get some carbs back into your muscles within 30 minutes after your session. As for protein, you’ve got a larger window — the 2 hours after your workout is the best time to eat protein to get your muscles building again.9

4. Sleep – it’s important

Getting enough sleep is important for your overall health and well-being. A bad night’s rest, or continuously getting too little sleep can have negative effects on your physiological and cognitive function — and won’t do your bulk any favours either.10

During non-rapid-eye-movement (NREM) sleep — this is when you’re asleep, but not dreaming — your body releases growth hormone. As the name would suggest, this hormone is involved in tissue growth and repair. You also release anabolic (building) hormones during NREM, which prevent the breakdown of muscle proteins and help you keep your muscle size.11

When you’re bulking, you want to make sure there’s enough growth and anabolic (muscle building) hormones hitting your muscles by getting enough NREM sleep — at least 7 hours a night should do it.


Take home message

There’s more to bulking than eating what you want, when you want. To bulk properly and see the best results, you need to get the basics right first. Follow these steps, take it slow, and see where your bulking journey can take you — there’s more to gain than muscle. If you like it simplified:

Train. Eat. Rest. Sleep. Repeat.

Our articles should be used for informational and educational purposes only and are not intended to be taken as medical advice. If you're concerned, consult a health professional before taking dietary supplements or introducing any major changes to your diet.

1Tipton, K. D., Ferrando, A. A., Phillips, S. M., et al. (1999). Postexercise net protein synthesis in human muscle from orally administered amino acids. American Journal of Physiology, 276(4), 628-634.

2Ananieva, E.A., Powell, J.D., Hutson, S.M., (2016). Leucine Metabolism in T Cell Activation: mTOR Signaling and Beyond. Advances in Nutrition, 7(4), pp. 798-805. doi:10.3945/an.115.011221

3Elango, R., Ball, R. O. & Pencharz, P. B. (2014). Tolerability of Leucine in Humans. Branched Chain Amino Acids in Clinical Nutrition, 3-13.

4Areta, J. L. & Hopkins, W. G. (2018). Skeletal Muscle Glycogen Content at Rest and During Endurance Exercise in Humans: A Meta-Analysis. Sports Medicine, 48(9), 2091-2102.

5Areta, J. L., Burke, L. M., Ross, M. R., et al. (2013). Timing and distribution of protein ingestion during prolonged recovery from resistance exercise alters myofibrillar protein synthesis. The Journal of Physiology, 591(9), 2319-2331.

6Escobar, K. A., VanDusseldorp, T. A. & Kerksick, C. M. (2016). Carbohydrate intake and resistance-based exercise: are current recommendations reflective of actual need? British Journal of Nutrition, 116(1228), 2053-2065.

7Bishop, P. A., Jones, E. & Woods, A. K. (2008). Recovery From Training: A Brief Review: Brief Review. Journal of Strength and Conditioning Research, 22(3), 1015-1024. doi: 10.1519/JSC.0b013e31816eb518

8McLester, J. R., Bishop, P. A., Smith, J., et al. (2003). A Series of Studies-A Practical Protocol for Testing Muscular Endurance Recovery. Journal of Strength and Conditioning Research, 17(2), 259-273.

9Aragon, A. A. & Schoenfeld, B. J. (2013). Nutrient timing revisited: is there a post-exercise anabolic window? Journal of the International Society of Sports Nutrition,10(5). doi: 10.1186/1550-2783-10-5

10Fullagar, H. H. K., Skorski, S., Duffield, R., et al. (2015). Sleep and Athletic Performance: The Effects of Sleep Loss on Exercise Performance, and Physiological and Cognitive Responses to Exercise. Sports Medicine, 45(2), 161-186.

11Sassin, J. F., Parker, D. C., Mace, J. W., et al. (1969). Human growth hormone release: relation to slow-wave sleep and sleep-walking cycles. Science, 165(3892), 513-515. doi: 10.1126/science.165.3892.513

Alice Pearson
Writer and expert
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