Count calories in a day from foods.
Counting a day's calories is addition, but the useful output is the comparison against a target and the shape of the distribution. Totalling the four eating slots gives intake; subtracting the target gives the surplus or shortfall that actually drives weight change. The share taken by the largest slot is the practical lever — when one meal or the snack line carries over 40 percent of the day, trimming it is far easier than shaving a little from everything. A tolerance of 100 kcal either side is treated as on target, because portion estimation is rarely more accurate than that.
Daily intake
Total = breakfast + lunch + dinner + snacks and drinks
Balance
Balance = total intake - daily target; positive is a surplus
These figures are population-average estimates for general planning only and are not medical or dietetic advice. Individual energy and nutrient needs vary widely with body composition, activity, medication and health status. Consult a qualified health professional or registered dietitian before making significant changes to what you eat, and especially if you are pregnant or breastfeeding, are under 18, or have a medical condition or a history of disordered eating.
Studies consistently find under-reporting of 15 to 30 percent, concentrated in snacks, cooking fats and drinks. If your logged total sits at target but weight is not moving, the snacks and drinks line is the usual culprit.
No. Weight change tracks the weekly energy balance, so a 600 kcal surplus on one day offset across the remaining days has almost no effect. Log the day honestly and look at the seven-day average.