The two phases of body composition change are bulking (gaining weight) and cutting (losing fat). Both require understanding your TDEE (Total Daily Energy Expenditure) and adjusting calories accordingly. Done right, you gain muscle with minimal fat. Done wrong, you gain 20 lbs of fat in a "bulk" or lose muscle in a "cut."
Your TDEE is how many calories you burn in a day including exercise. It's your maintenance level — eat this many calories and your weight stays the same.
The Mifflin-St. Jeor equation is the most validated:
Add 200-400 calories above maintenance. This produces ~0.25-0.5 lbs of weight gain per week. Slow enough that most of it is muscle, not fat.
Subtract 300-500 calories below maintenance. This produces ~0.5-1 lb of weight loss per week. The key is staying in a moderate deficit so your body burns fat, not muscle.
Beginners and people returning to training after a break can gain muscle and lose fat simultaneously by eating at maintenance calories with high protein. This is the "newbie gains" phase that makes everything else simpler.
Bulk in a 200-400 calorie surplus. Cut in a 300-500 calorie deficit. Keep protein high (0.8-1.2g/lb). Track your weight trend weekly and adjust. The math is simple — the hard part is consistency.
How Long Should Each Phase Last
One of the most common mistakes is switching phases too quickly. A bulk that lasts three weeks produces almost no meaningful muscle gain. A cut that lasts two weeks barely touches body fat stores. Both phases require sustained commitment to produce visible results.
A practical guideline for most intermediate lifters: bulk for 3-6 months, then cut for 6-12 weeks. This allows enough time to add genuine muscle tissue before entering a deficit. Longer bulks work well for people who are lean to begin with. Shorter bulks make sense if you are already carrying more body fat than you want to maintain long-term.
For beginners, the recomposition phase, which the existing article describes, can last 6-12 months before the rate of newbie gains slows enough to make deliberate bulking or cutting more worthwhile. Patience here pays off in a better body composition baseline before you ever do a dedicated cutting phase.
Signs Your Bulk Has Gone Too Far
A lean bulk should produce gradual, mostly-muscle weight gain. If any of the following appear, you have likely overshot your surplus:
- You are gaining more than 1 lb per week consistently as an intermediate lifter
- Your waist measurement is increasing faster than your chest or shoulder measurements
- Your strength is not increasing proportionally to your weight gain
- You feel sluggish, bloated, or your sleep quality has dropped
None of these are disasters. They simply signal that you should drop calories by 100-200 per day and reassess after two weeks. The goal of a lean bulk is to gain strength and muscle while keeping fat gain manageable. There is no virtue in rushing it.
Preserving Muscle During a Cut
The single most important variable for keeping muscle during a calorie deficit is protein intake. At 1.0 to 1.2g per pound of bodyweight, your body has sufficient raw material to maintain lean tissue even when total calories are reduced. Dropping protein to save calories during a cut is counterproductive and leads to a worse body composition outcome even if the scale moves in the right direction.
Continuing to train with progressive overload during a cut is equally important. Resistance training signals to your body that muscle tissue is being used and should be preserved. Switching to exclusively cardio during a cut removes that signal and accelerates muscle loss relative to fat loss.
Keep deficit moderate, keep protein high, keep lifting heavy. These three together produce fat loss with minimal muscle loss, which is the goal of every cut.
Cardio During Bulking and Cutting
Cardio does not need to be eliminated during a bulk. Two to three sessions of moderate cardio per week supports cardiovascular health, improves workout recovery, and helps manage fat accumulation during a surplus. Just account for the calories burned when calculating your daily intake, otherwise you may end up eating at maintenance without realizing it.
During a cut, cardio is one of two levers for creating a deficit, the other being reduced food intake. Most people find a combination works better than relying on either extreme. Cutting 250-300 calories from food and adding 150-200 calories of additional activity per day is more sustainable and preserves muscle better than a large food restriction alone.
High-intensity cardio, such as sprints or circuit training, adds meaningful training stress on top of your lifting sessions. If recovery starts to suffer during a cut, reduce or replace it with lower-intensity steady-state work rather than eliminating cardio entirely.
Practical Meal Planning for Each Phase
Bulking meals
Calorie-dense, nutrient-rich foods make hitting a surplus easier without requiring enormous meal volume. Whole milk, nut butters, oats, rice, pasta, red meat, salmon, and avocado all work well. Do not rely on junk food to hit your calorie target. The quality of the surplus affects training energy, recovery, and long-term health even if it does not change the rate of muscle gain much.
Cutting meals
Volume eating becomes useful during a cut. Foods that are filling but low in calories help manage hunger. Vegetables, lean proteins, broth-based soups, fruit, and high-fiber grains all provide satiety relative to their calorie content. Structuring meals to include protein and fiber at every sitting reduces the likelihood of impulsive overeating later in the day.
Who Should Not Bulk or Cut
Deliberate bulking and cutting phases are most appropriate for people who have been training consistently for at least 6-12 months and have basic nutrition habits already in place. True beginners get better results from recomposition at maintenance calories. People with a history of disordered eating should approach deliberate deficit phases carefully and may benefit from working with a registered dietitian rather than following generic protocols. Structured phases are a tool, not a requirement, and are only useful when the fundamentals are already solid.