1. What is a Portion Size Calculator for Weight Loss?

Definition: This calculator determines the appropriate food portion size based on your calorie target, the food's energy density, and number of servings.

Purpose: It helps with weight management by calculating precise portion sizes that align with your calorie goals.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Portion} \) — Food per serving (grams, g)
• \( \text{Calories} \) — Target calories (kcal)
• \( \text{E\_density} \) — Energy density (kcal/g)
• \( \text{Servings} \) — Number of servings (dimensionless)

Explanation: The target calories are divided by the product of energy density and number of servings to determine the portion size per serving.

3. Importance of Portion Control

Details: Proper portion control helps maintain calorie deficits for weight loss, prevents overeating, and teaches better eating habits.

4. Using the Calculator

Tips: Enter your calorie target, the food's energy density (default 2.5 kcal/g for typical processed foods), and number of servings. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is energy density?
A: Energy density is the number of calories per gram of food. Lower density foods (like vegetables) help with weight loss.

Q2: What's a typical energy density?
A: Vegetables (~0.3 kcal/g), fruits (~0.6 kcal/g), lean proteins (~1.5 kcal/g), processed foods (~2.5-4 kcal/g).

Q3: How do I find a food's energy density?
A: Check nutrition labels (calories per serving ÷ grams per serving) or use food databases.

Q4: Should I measure portions by weight or volume?
A: Weight (grams) is more accurate than volume (cups) for consistent portion control.

Q5: Does this account for different macronutrients?
A: No, this calculates total calories only. For macros, use a dedicated nutrition calculator.