Self-monitoring (food logging and weighing)
Tracking what you eat and weighing yourself regularly are consistently linked to more weight loss and less regain. Much of the evidence is observational, but a trial built around daily weighing reduced regain, and logging gets quicker with practice.
What the science says
- Logging food is consistently linked to more weight loss Moderate evidence
Burke et al.'s 2011 systematic review of 22 studies found a consistent association between self-monitoring of diet, exercise or weight and weight loss, although the level of evidence was weak because of study design and reliance on self-report.
- Regular self-weighing helps without harming mood Moderate evidence
Zheng et al.'s 2015 review of 17 studies found that regular self-weighing was associated with more weight loss and was not associated with depression or anxiety.
- Logging often matters more than logging long Limited evidence
Harvey et al. (2019) followed 142 adults in an online program: time spent logging fell from 23 to 15 minutes a day over 6 months, and those who lost at least 10% logged in more often per day (2.7 vs 1.7 times).
- A daily-weighing program reduced regain Moderate evidence
Wing et al.'s 2006 NEJM trial randomized 314 people who had recently lost weight. With a self-regulation program based on daily weighing, delivered face to face, 46% regained 2.3 kg or more over 18 months vs 72% of controls.
How to apply it
Log food daily during active dieting and weigh yourself regularly, judging progress by trends rather than single numbers.
Who should be careful
If logging or weighing causes distress, obsession or rigid eating, stop and seek help. People with an eating-disorder history should not self-monitor without guidance from a clinician. Anyone with diabetes, high blood pressure or another obesity-related condition, a history of eating disorders, who is pregnant or breastfeeding, or who is considering weight-loss medication should plan weight loss with a physician or registered dietitian; this page gives no drug advice.
Frequently asked questions
Do I need to count calories to lose weight?
Not strictly, but tracking food is consistently linked to more weight loss in the studies reviewed by Burke et al., and it shows whether you are in a deficit.
Is weighing myself every day bad for my mental health?
In a review of 17 studies, regular self-weighing was linked to more weight loss and not to depression or anxiety. If it causes distress for you, stop.
How much time does food logging take?
In Harvey et al.'s study, about 23 minutes a day in the first month, falling to about 15 minutes by month 6; logging often mattered more than time spent.
Scientific references
More on weight loss
- Calorie deficit Strong evidence
Fat loss requires eating fewer calories than you burn for weeks to months; every diet that works does this, whatever it is called.
- Rate of weight loss Moderate evidence
For people who lift, losing about 0.
- High-protein diet while dieting Strong evidence
Eating more protein during a calorie deficit helps keep lean mass and gives a small extra fat loss compared with a standard-protein diet of the same calories.
- Resistance training while dieting Strong evidence
Lifting weights during a diet makes much more of the weight you lose come from fat instead of muscle, and it keeps or raises strength.
- Cardio for weight loss Moderate evidence
Cardio helps fat loss, but at typical doses it produces only a couple of kilograms on its own; clinically meaningful loss takes high volumes (more than about 250 minutes a week) or a calorie deficit alongside it.
- Diet breaks and refeeds Moderate evidence
Planned periods at maintenance calories in the middle of a diet are at least as effective as dieting continuously and may make the diet easier to tolerate.