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Daily calorie needs for adults over 50 using the Mifflin-St Jeor equation, with activity factors, a safe intake floor and senior protein targets.
The Senior Calorie Needs Calculator estimates daily energy requirements for adults aged 50 and over using the Mifflin-St Jeor equation, which subtracts 5 kcal of resting metabolism for every year of age and is the prediction equation recommended by the Academy of Nutrition and Dietetics. Resting energy is multiplied by an activity factor from 1.2 to 1.9, adjusted for a weight goal, and held above a safe intake floor. It also reports the higher protein target of 1.0 to 1.2 g per kg of body weight that PROT-AGE and ESPEN recommend for older adults.
Open Senior Calorie Needs Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Mifflin-St Jeor includes an explicit age term, so the fall in resting metabolism is calculated rather than assumed.
Uses the 1.0-1.2 g/kg older-adult target, well above the general 0.8 g/kg RDA, and 1.2-1.5 g/kg during illness.
Weight-loss targets are never allowed below 1,200 kcal for women or 1,500 for men without supervision.
It depends on sex, weight, height and activity, but a lightly active 70-year-old woman of 65 kg and 160 cm needs roughly 1,570 kcal a day, while a sedentary 68-year-old man of 78 kg and 175 cm needs about 1,850 kcal. Enter the actual figures rather than relying on an average, because weight and activity move the number by several hundred calories.
Mostly because muscle mass falls, and muscle is metabolically active tissue. The Mifflin-St Jeor equation captures this as a 5 kcal reduction in resting metabolism per year of age, which becomes 60 to 95 kcal a day per decade once an activity factor is applied. Resistance exercise slows the loss by preserving muscle.
The PROT-AGE study group and ESPEN recommend 1.0 to 1.2 grams of protein per kilogram of body weight per day for healthy older adults, rising to 1.2 to 1.5 g/kg with acute or chronic illness. That is well above the 0.8 g/kg general adult RDA, and spreading it across meals rather than loading it into dinner helps muscle use it. People with kidney disease need a target set by their doctor.
Deliberate, slow weight loss can help when excess weight is affecting joints or blood sugar, but rapid loss in later life takes muscle and bone with the fat and raises frailty and fracture risk. Aim for no more than about 0.5 kg a week, keep protein high, add resistance exercise, and have any unintentional weight loss investigated by a doctor.
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