Key Takeaways
- A calorie deficit means using more energy than you eat — the one principle behind every diet that actually works, whatever the eating style.
- Your TDEE is the energy your body uses in a day, estimated as BMR × an activity multiplier. Once you know it, set a sensible deficit of about 500–750 calories a day to lose roughly 0.5–1 kg per week.
- The calculated number is only a starting point — you must track real weight and adjust. For those who stall on their own or can't control hunger, YOUNIFY offers a medically guided program including GLP-1 and ESG.
What is a calorie deficit? Energy balance explained
The body works like an energy account. The income side is calories from food and drink; the spending side is the energy used to live and move. When income exceeds spending, the surplus is stored as fat (a calorie surplus). When spending exceeds income, the body draws on stored fat (a calorie deficit).
This is why every weight-loss approach — keto, intermittent fasting, clean eating — works through the same mechanism: creating a deficit. No single food burns fat on its own. Understanding this frees you from chasing shortcuts and lets you focus on what truly matters: eating a little less than you use, in a way you can sustain.
- Income > spending = surplus, stored as fat
- Spending > income = deficit, draws on stored fat
- Every weight-loss method works by creating a deficit
Estimating your TDEE: BMR × activity
TDEE (Total Daily Energy Expenditure) is the energy your body uses in a full day. It starts with BMR (basal metabolic rate), the energy used at rest to keep your organs running, roughly estimated with the Mifflin-St Jeor formula, then multiplied by an activity factor to reach TDEE.
For example, if your BMR is about 1,500 calories and you are moderately active (× 1.55), your TDEE is around 2,325 calories a day — the amount at which your weight stays stable. This figure is an estimate; real accuracy comes from tracking your actual weight over several weeks.
| Activity level | Description | BMR multiplier |
|---|---|---|
| Mostly sedentary | Desk job, little exercise | 1.2 |
| Light | Light exercise 1–3 days/week | 1.375 |
| Moderate | Exercise 3–5 days/week | 1.55 |
| High | Hard exercise 6–7 days/week | 1.725 |
| Very high | Twice-daily training / physical job | 1.9 |
Setting a sensible deficit, then tracking and adjusting
Once you know your TDEE, set a sustainable deficit of about 500–750 calories a day, which loses roughly 0.5–1 kg per week. Do not cut much deeper — below 1,200 calories for women or 1,500 for men — because you risk nutrient shortfalls, muscle loss, and hunger you can't control.
More important than precise math is tracking and adjusting. Weigh yourself at the same time 2–3 times a week and look at the average. If weight hasn't moved in 2–3 weeks, trim calories slightly or add movement — because as weight falls, TDEE falls too, so the deficit needs periodic adjustment.
- Set a 500–750 calorie/day deficit to lose ~0.5–1 kg/week
- Don't go below 1,200 (women) / 1,500 (men) calories
- Weigh in consistently, look at the average, adjust when needed
- As weight drops, TDEE drops — reset your deficit
When self-directed deficits stall: the medical options
Many people calculate and control calories carefully yet still plateau, or get too hungry to keep going. That isn't a personal failure — the body has hormonal mechanisms that resist weight loss, both lowering metabolism and raising hunger, especially in people with obesity. Obesity is a medical condition that sometimes needs more than counting calories.
At YOUNIFY we help the deficit you've built actually work and last, starting with behavior and nutrition as the foundation (lifestyle intervention), adding GLP-1 medication when appropriate to reduce hunger and make calorie control easier, and — for those wanting greater non-surgical results — endoscopic sleeve gastroplasty (ESG), which brings fullness sooner and naturally smaller portions.
Lifestyle intervention (the base)
An individualized nutrition plan with a realistic deficit — the foundation that makes every method work.
GLP-1 medication
Reduces hunger and cravings so staying in a deficit is easier, without suffering, used under medical supervision.
Endoscopic sleeve gastroplasty (ESG)
Sutures the stomach smaller through an endoscope via the mouth — no incisions, faster fullness, sustainable portion control.
Frequently Asked Questions
How many calories should I eat to lose weight?
Eat about 500–750 calories below your TDEE per day to lose roughly 0.5–1 kg per week. The exact number depends on your sex, weight, height, and activity level. Calculate your own TDEE as a starting point, then adjust to your real results.
Do I have to count calories?
You don't need to count precisely forever, but counting early on shows how much you're really eating — usually more than you think. Once you get a feel for it, many people control intake through food choices and portions without logging every meal.
Why isn't my calculated deficit producing the expected loss?
The calculated figures are estimates, and people often underestimate what they eat. Plus, as weight falls, TDEE falls too. The fix is to track real weight, measure portions more accurately, and reset your deficit periodically.
Can I set a deficit larger than 750 calories to lose faster?
You can short-term under supervision, but too deep a deficit risks muscle loss, nutrient shortfalls, and hunger that makes you quit. For most people, 500–750 calories is the sweet spot between speed and sustainability.
References
- Maintenance of Lost Weight and Long-Term Management of Obesity (Medical Clinics of North America, 2018)
- Improvement of Obesity-Related Comorbidities After Bariatric Procedures: A Network Meta-Analysis of Endoscopic Versus Surgical Interventions (Digestive Diseases and Sciences, 2026)
Want to know which care plan fits you?
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