Lost Weight While Bulking? Find Out Why in Two Steps

November 7, 2026

You started a bulk at 160 lb (73 kg), you've been eating "more" for three weeks, and the scale now says 158. That's annoying, but it's also useful: it's the clearest signal the scale ever gives you. Check your weekly average weight first. If it's really down, check your log for days under maintenance. That's the cause far more often than a slow metabolism.

Step 1: is it real, or is it noise?

One morning number can swing 1 to 3 lb (0.5 to 1.5 kg) from salt, a late meal, a hard leg day or a bad night. So don't judge by one weigh-in. Weigh every morning, add up seven days, divide by seven, and compare this week's average with last week's.

If the average is down by more than about 1 lb (0.5 kg) across two weeks, treat it as real. If it moved less than that, you're flat, not losing, and the fix is different (see weight not going up on a bulk).

One more cause that's easy to miss: if you cut carbs, sodium or food volume when you "cleaned up" your diet, you can drop a pound or two of water and stored carbohydrate in the first week or so. That drop stops. A loss that keeps going into week three isn't water.

Step 2: add up the real week

Meet a 24-year-old, 160 lb (72.6 kg), 5'10" (178 cm), lightly active, lifting three days a week. Bulky's calculator (Mifflin-St Jeor, then activity and training, then a moderate surplus) gives him:

Maintenance: about 2,430 calories
Bulk target: about 2,980 calories
Protein: about 116 g

He believes he's on plan. His log for the week says otherwise:

2 days at 2,980 (training days, he ate properly)
3 days at 2,100 (busy, skipped lunch)
2 days at 1,700 (weekend, mostly liquid and one late meal)

Total: 2 × 2,980 + 3 × 2,100 + 2 × 1,700 = 15,660, or about 2,240 a day. That's roughly 190 a day under maintenance, or about 1,350 a week. At about 3,500 calories per pound, that's close to 0.4 lb (0.2 kg) lost per week. Add the water from a lower-carb start and you get his 2 lb drop in three weeks.

He didn't fail at eating. He ate well two days and called it a bulk. A target only works as a weekly average, and the average is dragged down by the days you don't write down.

Why people drift under without noticing

Appetite drops with routine. New job, new hours, summer heat: you feel full sooner and don't compensate.
Burn went up. More steps, a physical job, a new sport or a cardio habit can add a few hundred calories a day. Your target was set for the old life.
Liquid and snack calories vanish from memory. The meals you log are fine. The gaps are the days you ate "whatever."
Illness or stress. A week of bad sleep or a cold can wipe out appetite. Don't read a bad week as a trend.

If you've been eating above maintenance for a month and still lose weight, or you're losing without trying and feeling unwell, talk to a doctor. This article can't diagnose that.

What to change

Don't raise the target first. His target of 2,980 is fine; he hit it twice. The fix is to bring the five low days up to something close. Three easy ways:

Make lunch a fixed meal, not an option. Rice, chicken thighs and a tablespoon of olive oil (about 120 calories) is 800 to 900 calories you don't have to think about.
Drink part of the gap on busy days: a glass of whole milk is about 150 calories, and a banana with peanut butter is about 300.
Eat the first big meal within an hour of waking on weekends.

The label on your food wins over these round numbers. If he lands near 2,900 on six days out of seven, his week averages around 2,850, about 400 above maintenance. That's roughly 0.8 lb (0.4 kg) a week, and the average should turn upward within two weeks.

Do this today

Open the last seven days of your log. Count the days under maintenance. If it's more than two, that's your answer, and the plan is to close those days, not to change the target. Re-check the weekly average in two weeks.

Where a photo helps

A bulk fails on the days you don't write down, and a photo is the lowest-effort way to write one down. Bulky reads calories, protein, carbs, fat, fiber and sugar from one photo of your meal and measures the day against your surplus target, so a 1,700-calorie Saturday shows up that evening, not three weeks later on the scale. A photo is a very good estimate, not a food scale, and you can correct any item after the scan. There's no cutting mode, by design.