ISSA Weight Management cheat sheet

Energy balance rule: body mass changes when intake differs from expenditure; a sustained deficit of roughly 500 kcal/day predicts about 0.45 kg (1 lb) of fat loss per week.

Total daily energy expenditure (TDEE) = resting metabolic rate (about 60-70% of TDEE) + thermic effect of food (about 10%) + activity thermogenesis (exercise plus nonexercise activity).

Resting metabolic rate is largely determined by fat-free mass; losing weight lowers RMR, so predicted loss rates slow over time unless expenditure or intake is adjusted.

Sleep restriction (commonly studied at 4-5 h/night) raises ghrelin, lowers leptin, and increases hunger and preference for energy-dense foods.

Self-monitoring (food logs, daily weighing, step counts) is consistently associated with better weight-loss maintenance in behavioral programs.

Behavior-change decision rule: set SMART goals (specific, measurable, achievable, relevant, time-bound) and target a 5-10% initial body-weight reduction, the range linked to clinically meaningful health gains.

Maintenance rule: continued self-monitoring, high physical activity (often cited around 200-300 min/week), and regular breakfast/consistent meal patterns are common traits of successful weight-loss maintainers.

Alcohol supplies about 7 kcal/g and is metabolized before fat oxidation resumes, so heavy drinking can blunt deficit adherence; screen for sleep, stress, and alcohol as confounders.

Macronutrient energy values: carbohydrate 4 kcal/g, protein 4 kcal/g, fat 9 kcal/g, alcohol 7 kcal/g.

Weight-loss energy deficit: reducing intake by 500-750 kcal/day from estimated TDEE typically produces 0.5-0.75 kg/week loss; deficits below about 1,200 kcal/day (women) or 1,500 kcal/day (men) rarely suit unsupervised clients.

Protein target during deficit: roughly 1.2-2.0 g/kg body weight per day supports lean-mass retention; higher intakes also raise satiety.

Fiber target: about 25-38 g/day; high-fiber, high-water-volume foods lower energy density and increase fullness per calorie.

Energy density rule: foods below about 1.5 kcal/g (vegetables, fruit, cooked grains, lean proteins) promote satiety; foods above 4 kcal/g (oils, nuts, fried foods) are easy to overconsume.

Carbohydrate and fat are not inherently fattening; total energy and adherence determine outcomes, so diet selection should match client preference and sustainability.

Very-low-calorie diets (under about 800 kcal/day) require medical supervision and are reserved for selected cases with higher BMI.

Label math: servings per container multiply all listed values, so a 2-serving package doubles calories, fat, and sodium.

General activity guideline: 150-300 min/week of moderate-intensity aerobic activity plus 2 or more days/week of resistance training for adults.

Resistance training during a deficit preserves fat-free mass; it does not need to be high-volume, but should train major muscle groups 2-3 days/week.

MET formula: kcal = MET x 3.5 x body weight (kg) / 200 x minutes. Walking briskly (about 4 METs) for 30 min at 70 kg burns roughly 147 kcal.

Exercise alone rarely produces large weight loss because activity typically adds a few hundred kcal/day; it is most powerful for maintenance and cardiometabolic health.

Compensation rule: appetite and nonexercise activity can offset part of exercise energy expenditure, so program adherence and dietary intake must be monitored.

Progression rule: increase weekly volume or intensity by no more than about 10% to reduce injury risk, especially in previously sedentary clients.

Non-exercise activity thermogenesis (NEAT) varies widely between individuals and can exceed formal exercise calories; step counts are a practical proxy.

Screen before vigorous exercise: clients with cardiovascular, metabolic, or renal disease risk factors should obtain medical clearance per standard screening tools.

Readiness rule: assess motivation and stage of change before prescribing; a client not ready for action benefits more from education and small goals than a strict diet plan.

Relapse plan: identify high-risk situations (travel, holidays, stress) and pre-plan responses; a lapse treated as temporary predicts better long-term maintenance than all-or-nothing thinking.

Social environment matters: household food availability, meal planning with family, and social support are modifiable determinants of intake.

Stress and cortisol can increase appetite and abdominal fat storage; sleep, stress management, and routine are legitimate lifestyle targets alongside diet and exercise.

Hydration and volume: water-rich foods and soups increase fullness; drinking water before meals modestly reduces intake in some studies.

Sugar-sweetened beverages are the strongest single dietary predictor of weight gain in observational data; replacing them with water or noncaloric drinks is a high-yield change.

Meal timing is secondary to total intake; however, front-loading calories and consistent meal times can improve adherence for some clients.

Formula check: Mifflin-St Jeor for men = 10(kg) + 6.25(cm) - 5(age) + 5; for women = 10(kg) + 6.25(cm) - 5(age) - 161. Multiply by an activity factor (1.2 sedentary to 1.9 very active) for TDEE.

EPOC (afterburn) from typical sessions is small, often 6-15% of session energy expenditure, so it should not be oversold as a weight-loss tool.

Combined approach: diet plus exercise produces greater fat loss and better maintenance than diet alone, largely by preserving lean mass and supporting adherence.

Session design: warm-up, aerobic or resistance work, and cool-down; document mode, intensity (RPE or heart rate), duration, and frequency for tracking.

Intensity anchors: moderate activity allows talking but not singing (about 3-6 METs); vigorous activity limits conversation (above 6 METs).