Questions
Calorie questions, answered
What you burn
- How accurate are TDEE calculators?The formula part lands within 10% for about 4 people in 5. The activity level you pick adds more error than the formula. Use the answer as a range, then check it.
- How many calories do I burn a day?About 1,950 to 2,380 for the average American man and 1,540 to 1,880 for the average woman under 5,000 steps a day. At 7,500 to 9,999 steps, about 30% more.
- How many calories do I burn doing nothing?More than you'd guess: about 1,290 a day lying still for a 140-pound woman and 1,730 for a 180-pound man. That's about 54 to 72 calories an hour.
- How many calories do I need to maintain my weight?A range, not one number. Start at the middle of a calculator's range, then 4 weeks of meals and weigh-ins find yours. It drops about 10 a day per pound you lose.
- How many calories should I eat a day?About what you burn: 1,540 to 1,880 for the average American woman and 1,950 to 2,380 for a man under 5,000 steps a day, more as you walk more. Eat less to lose.
- What activity level should I pick on a TDEE calculator?Pick it from your daily steps, not your gym days. Under 5,000 is sedentary, 7,500 to 9,999 moderately active, 12,500 and up very active. Unsure? Take the lower one.
- What is TDEE?Total daily energy expenditure: every calorie you burn in a day, resting, digesting and moving. It's 1.2 to 1.9 times your resting burn, set mostly by your steps.
- What's the difference between BMR and TDEE?BMR is what you'd burn lying still all day. TDEE adds digesting and moving, 1.2 to 1.9 times BMR, set by your daily steps. You eat against TDEE. BMR is your floor.
Losing weight
- How big should my calorie deficit be?Start at about 500 a day, the low end of the US guideline's 500 to 750. Or size it to you: 0.5 to 1% of your weight a week. Never below your floor.
- How many calories should I eat to lose 2 pounds a week?About 1,000 a day under your maintenance, and 500 for 1 pound a week. Two pounds only fits big or very active bodies. For many women it falls under the floor.
- How often should I recalculate my TDEE?Every 10 pounds you lose, or every 4 weeks if you log. Each pound lost lowers your burn by about 10 calories a day, so 10 pounds takes about 100 off your deficit.
- Is 1,200 calories a day too low?For men, yes. For women it's the lowest to go without a doctor, and often lower than needed: the average American woman burns about 1,430 a day lying still.
- Is 1,500 calories a day enough to lose weight?For many women: it's about 210 under the average American woman's burn at under 5,000 steps a day and 710 at 7,500 to 9,999. For most men, it's under resting burn.
Not losing
- Why am I gaining weight on 1,200 calories?Almost always because you're eating more than the log says. In a classic 1992 study, people sure they ate under 1,200 ate nearly twice that. Their metabolism was normal.
- Why am I not losing weight in a calorie deficit?Usually the deficit is smaller than the math says. Careful food logs ran 12 to 20% low in a lab-checked study, and labels can run 20% high. Check 4 weeks of weigh-ins.
- Why did my weight loss stop?Mostly because you're smaller. Each pound lost lowers your burn by about 10 calories a day, so after 20 pounds your old deficit is about 200 smaller. Measure and reset.
- Why does my weight go up and down every day?Mostly water and food in transit, not fat. Weight runs higher after weekends and falls through the week. Average 7 mornings and compare week to week.
Watches and rings
- Are Fitbit, Garmin and Oura calories accurate?No brand is accurate for calories. A review of 158 studies found Fitbit, Garmin and others often good for steps and heart rate, and none accurate for energy burned.
- Is Apple Watch calorie burn accurate?Not very. Across 56 studies its calorie estimate was off by about 28% on average, against 4% for heart rate and 8% for steps. Trust its steps more than its calories.
- What's the difference between active and total calories?Active calories are what you burn moving. Total adds your resting burn. Your TDEE is the total, so don't add active calories on top of a target built from it.
Metabolism
- Do women burn fewer calories than men?Yes, mostly from size and muscle: the average American woman burns about 450 fewer a day than the average man under 5,000 steps. Matched for body makeup, no gap.
- Does dieting slow your metabolism?A little, and mostly because you're smaller. After a 30-pound loss, the extra dip was about 90 calories a day, and about 40 after a month at a steady weight.
- Does muscle burn more calories than fat?Yes, about 3 times as much, but it's small: about 6 calories a day per pound of muscle at rest, against 2 for fat. 5 pounds of new muscle adds about 30 a day.
- Does sleep affect how many calories you burn?A short night burns about 5% more, since you're awake longer. But people ate more than that and gained weight, and dieters on short sleep lost less fat.
Food and drink
- How accurate is calorie counting?Rough. Careful food recalls ran 12 to 20% low in a lab-checked study, and labels can run 20% high. Counting still works if you're consistent and check your scale.
- How many calories does digestion burn?About 5 to 15% of your day, roughly 100 to 300 calories at 2,000. Protein costs the most: 20 to 30% of its calories go to processing it, against 0 to 3% for fat.
- How much protein should I eat in a calorie deficit?1.2 to 1.6 g per kg of your weight a day is typical, about 100 to 130 g at 180 pounds. Under that is too low, and many people are. Lean lifters need more.
Exercise
- How many calories do 10,000 steps burn?A few hundred more than sitting, set mostly by your weight: about 240 to 320 at 150 pounds and 400 to 530 at 250. A heavier body pays more per step.
- How many calories does lifting weights burn?About 150 to 300 above sitting for a 45-minute session at 180 pounds, set by how hard you go. Its bigger payoff is the muscle it keeps while you diet.
- How many calories does walking a mile burn?About 100 for a 180-pound person, or 75 more than sitting for those 20 minutes. Heavier people burn more. A mile run burns only about half again as much.
Photograph your meals, weigh in most mornings and let your steps come in from your phone or watch. Open Gyroscope
