CARB CYCLE – How to Carb Cycle for Fat Loss

CARB CYCLE – How to Carb Cycle for Fat Loss

Carb cycling is basically just planned changes in carbohydrate intake in order to accelerate fat loss and/or avoid weight loss plateaus. The traditional approach has you rotate through high-carb, moderate-carb, and low-carb days while protein intake remains unchanged. Fat intake becomes low when carbs are high, and high when carbs are low.

The idea is simple:

  • High-carb days restore glycogen levels and spike insulin, which inhibits muscle breakdown.
  • Moderate-carb days allow you to maintain full glycogen stores and thus allow you to maintain performance while being in a slight deficit.
  • Low-carb days – typically rest days – are when you supposedly “trick” your body into burning fat at an accelerated rate.

Smart Carb Cycling

Let’s first look at an example of what your macronutrient breakdown might look like and then we’ll dive into how you can structure carb intake for maximum performance and muscle preservation.

Step 1: Find Your Macronutrient Breakdown

Protein: Maintaining muscle mass while restricting calories requires an adequate protein intake. Although the science is pretty clear that we don’t need more than about 0.8g per pound of bodyweight to build muscle, a study conducted by AUT University concluded that energy-restricted athletes will need a bit more.

Their conclusion was that you need about 1 to 1.2 grams of protein per pound of fat free mass to maintain muscle tissue. The leaner you are and the longer you’ve been restricting calories, the higher up on the scale you should go. The opposite is also true – someone with more body fat who has been dieting for a shorter period of time can get away with a lower protein intake.

Now, most guys who simply use “bodyweight x 1” will land in an acceptable range. But if you want to get more detailed, see the example below.

Using a 180 pound lifter who’s 15% body fat:

180 x 0.15 = 27 pounds of body fat
180 – 27 = 153 pounds of lean body mass
Lean body mass x 1.2 = daily protein in grams
153 pounds x 1.2 = 184g of protein per day

Fats: Consuming 20-35% of your total calories in dietary fat is more than enough to get the benefits of a healthy fat intake. This equates to about 0.3 to 0.4 grams of fat per pound of bodyweight.

Bodyweight (x) 0.4 = daily fat in grams
180 pounds x 0.4 = 72g of fat per day

Carbs: A physically active person should never avoid carbs. Carbs are our body’s main source of energy and are in fact inefficiently stored as body fat, even when overfeeding. You should consume as many carbs as your calorie intake will allow while remaining in a deficit. A good starting point is about 1 to 1.5x bodyweight in grams of daily carbs.

Bodyweight (x) 1-1.5 = daily carbohydrates in grams
180 pounds x 1.5-2 = 180-270g of carbs per day

Step 2: Break Carbs and Fats Down into Weekly Intake

Using these examples, a 180-pound man would start off at 180g of protein, 72g of dietary fat, and about 225g of carbs per day. This equates to a little under 2300 kcal per day and about 16,000 kcal per week. And as long as we can ensure we’re consuming that amount or less (and are in a deficit), we’ll lose fat, despite how fats and carbs are distributed throughout the week.

This means we’ve got about 500g of fats and about 1575g of carbs per week to play with. The idea is to manipulate intake while staying within these numbers to maximize performance in the gym. The better we perform in the gym, the less likely we are to sacrifice muscle tissue. And we know from research that the best way to maximize physical performance is to consume an adequate amount of carbs.

Step 3: Determine High, Moderate, and Low Carb Days

The next step is to figure out how many high-intensity sessions, how many medium-intensity sessions, and how many rest days your program prescribes. For example, with a push/pull or upper/lower routine, you’ve got two heavy sessions, two medium sessions, and three rest days.

If your program is periodized in a linear fashion where you’re not alternating intensity, use your high-carb days for sessions where you’re performing the most strenuous lifts (deadlift, squat, etc.).

  • High Intensity Training Days = High Carb Intake
  • Medium Intensity Training Days = Moderate Carb Intake
  • Rest Days = Low Carb Intake

The way you’ll distribute your carb intake is quite simple: 50% of your weekly intake for heavy sessions, 35% for medium sessions, and 15% for rest days.

For example, if your total weekly carb intake is 1575g and your program prescribes two heavy sessions, then you’d split 50% of your carbs (788g) into two days (394g). 35% of your weekly carb intake (551g) would be broken down into two days (275g) to fuel your medium training sessions, and the remaining 15% (236g) should be distributed evenly throughout your three rest days (78g).

  • High Carb Days = 394g of carbs
  • Moderate Carb Days = 275g of carbs
  • Low Carb Days = 78g of carbs

Step 4: Determine High, Moderate, and Low Fat Days

Distribute fat intake using a similar strategy:

  • High Intensity Training Days = Low Fat Intake
  • Moderate Intensity Training Days = Moderate Fat Intake
  • Rest Days = High Fat Intake

So 15% of your weekly fat intake (75g) should be distributed evenly between both heavy training days and 25% (125g) should be distributed evenly between your two medium sessions. The remaining 60% (300g) should be split up evenly between your three rest days.

  • High Fat Days = 100g of dietary fat
  • Moderate Fat Days = 63g of dietary fat
  • Low Fat Days = 38g of dietary fat

Once you’ve figured out what your low, moderate, and high carb/fat days will look like based on your individual needs and training program, using carb cycling to maximize performance in order to preserve muscle mass on a cut becomes a breeze.


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