Metabolism is the activity that keeps the body functioning. It does not simply turn off. Energy expenditure changes with body size, lean tissue, activity and other factors, so weight loss is rarely a straight line.
Why the same routine can produce a different result
A lighter body generally uses less energy to move. Appetite, spontaneous movement and energy expenditure can also adapt. This does not establish permanent damage or mean you need an extreme diet. NIDDK’s Body Weight Planner uses a changing rather than a purely linear model.
Distinguish a trend from a fluctuation
Water, salt intake, menstrual changes, constipation and the time of weighing affect the scale. If weighing is appropriate for you, use comparable conditions and look across several weeks. One unchanged reading does not establish a plateau.
Review before restricting further
- Are food amounts, drinks, oils and sauces recorded consistently?
- Has ordinary daily movement changed?
- Are sleep, stress or work making regular meals difficult?
- Has a medication, illness or injury changed?
- Is the goal still appropriate for your circumstances?
Choose a manageable adjustment rather than removing a whole food group. A TDEE estimate is only a starting point, not a laboratory measurement.
When to seek advice
Unintentional or rapid weight change, marked fatigue, unusual thirst, palpitations, swelling or other new symptoms need assessment. Pregnancy, breastfeeding, eating-disorder recovery and medication-dependent diabetes care require individual guidance. An app can organise records; it cannot explain a medical cause of weight change.
0Sources for this guide
- Energy balance and obesity: what are the main drivers? — Cancer Causes & Control / PubMed (2017)
- Optimal Diet Strategies for Weight Loss and Weight Loss Maintenance — Journal of Obesity & Metabolic Syndrome / PubMed Central (2021)
- Research Behind the Body Weight Planner — National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (updateable)
