Mass Gainer and Intermittent Fasting: Does It Work?

Intermittent fasting has become one of the most popular eating styles for fat loss, appetite control, and metabolic health. But what if your goal is the opposite?

👉 Can you gain weight — or even build muscle — while intermittent fasting?
👉 And is it okay to use a mass gainer during intermittent fasting?

The short answer is:

Yes — you can use a mass gainer while intermittent fasting.

But it only works if you still eat enough total calories and protein inside your eating window.

Let’s break it down 👇

First — What Is a Mass Gainer?

A mass gainer is a high-calorie supplement designed for people who:

• ✔ struggle to gain weight
• ✔ have a fast metabolism
• ✔ can’t eat large meals
• ✔ want more calories for muscle building

Most mass gainers contain carbohydrates, protein, and occasionally healthy fats along with added vitamins and minerals.

They help you reach a calorie surplus — the key requirement for weight gain.

What Is Intermittent Fasting?

Intermittent fasting (IF) means you cycle between eating and fasting windows.

Common methods include:

• 16:8 → 16 hours fasting, 8 hours eating
• 18:6 → 18 hours fasting, 6 hours eating
• 20:4 → 20 hours fasting, 4 hours eating

During the fasting window, you avoid calories — meaning no mass gainer, protein shake, or food.

Is Weight Gain Possible During Intermittent Fasting?

Yes — but only if:

You still eat more calories than your body burns inside your eating window.

This is called a calorie surplus.

A mass gainer makes that easier because it provides large calories in a small serving.

If you are:

• underweight
• skinny
• have poor appetite
• burn a lot of calories

Using a mass gainer during your eating window can support weight gain — even while fasting.

What Is the Best Time to Use Mass Gainer During Intermittent Fasting?

Only take it inside your eating window.

Best timings include:

• ✔ After workout
• ✔ With a meal
• ✔ As your last meal before fasting
• ✔ Split into 2 half-servings

Avoid taking it during fasting hours because it breaks your fast.

Benefits of Using Mass Gainer With Intermittent Fasting

1. Easier to Hit Calories

Many people find it difficult to eat enough food in 1–2 meals. Mass gainers help fill the calorie gap.

2. Supports Muscle Growth

Combined with strength training, the extra protein and calories help support muscle development.

3. Convenient & Quick

Perfect for people who work long hours, travel, or have a small appetite.

Possible Downsides You Should Know

1. Overeating & Fat Gain

Mass gainers are very high calorie. If you overshoot your calorie needs — you gain fat instead of lean mass.

2. Digestive Discomfort

Some people experience bloating, gas, or heaviness. Start slow or split your serving.

3. Poor Nutrition Choices

Mass gainer should SUPPLEMENT — not replace real food. You still need veggies, whole protein sources, carbs, and healthy fats.

Who Is Mass Gainer + Intermittent Fasting Good For?

Best suited for:

• ✔ Hard gainers
• ✔ Slim individuals
• ✔ Athletes
• ✔ People with high calorie needs
• ✔ Those lifting weights regularly

Conclusion

Mass gainers may be effectively incorporated into an intermittent fasting regimen if you still hit a calorie surplus and train consistently.

Think of it this way:

• 🔹 Fasting controls meal timing
• 🔹 Mass gainer helps meet calorie needs

Together they can support weight gain without forcing you to eat all day.

But remember:

• ✔ Prioritize whole foods
• ✔ Lift weights
• ✔ Stay consistent
• ✔ Track your calories

Frequently Asked Questions

1️⃣ Does mass gainer break a fast?
Yes — mass gainer contains calories, so it breaks your fast.

2️⃣ Can I gain muscle while intermittent fasting?
Yes, provided you follow an appropriate training regimen and consume sufficient protein and calories during your eating period.

3️⃣ When is the best time to take mass gainer?
Great times include after workout, during your eating window, or before starting your fasting period.

4️⃣ Will mass gainer make me fat?
Only if your calorie surplus is too high and you don’t train consistently.

5️⃣ Should beginners take mass gainer?
Yes — especially if you struggle to eat enough calories from food alone.

6️⃣ Can I mix mass gainer with milk?
Yes — but milk increases calories further. Use water if you want a lighter drink.