Macro Ratios will dynamically calculate your macronutrient targets to achieve the ratio of macros based on your calorie budget.
Your energy target will be derived dynamically from your total calories burned for the day (BMR, activity, and exercise) as well as your weight goal.
For example, if your daily burn is 2200 kcal, and your weight loss goal is to lose half a pound per week, this will require a 250 kcal energy deficit, your energy target for the day will be 1950 kcal (2200 kcal - 250 kcal). The protein, carbs, and fat targets will all then be calculated based on the chosen ratio to balance at your calorie target.
Note that the calorie target will dynamically change throughout the day if you log exercises or change a weight or body fat % biometric. This will also consequently change your macronutrient targets.
By setting your targets to a dynamic ratio, note that you will not be able to set a specific gram amount for each macronutrient. To set your macronutrient targets as a numeric value, select Fixed Targets.
The numbers you enter into your ratio, will not be equivalent to the target numbers found in your diary.
As an Example: a user enters a ratio of 3:4:3. Based on the user's settings for BMR, Activity, and Weight Loss Goal, an energy target for the day of 2624 kcal has been determined at the beginning of the day, before any foods or exercise has been logged.
Once the Energy target has been calculated, the user's macronutrient targets are:
Each Macronutrient has a different energy density calculated based on the Atwater Factors. In general:
Protein = 4 kcal/g
Carbohydrates = 4 kcal/g
Fat = 9 kcal/g
The ratio the user has chosen is 3:4:3. This means the energy target is split into a total of 10 parts (3+4+3). In this example each part is equal to 262.46 kcal
2624 kcal/10 = 262.46 kcal
So we can allot:
Protein: 262.46 kcal x 3 parts = 787.2 kcal
Carbohydrates: 262.4 kcal x 4 parts = 1049.6 kcal
Fat: 262.4 x 3 parts = 787.2 kcal
Dividing each calorie amount by the nutrient density will give the number of grams of each nutrient:
Protein: 787.2 kcal / 4 kcal/g = 196.8 g
Carbohydrates: 1049.6 kcal / 4 kcal/g = 262.4 g
Fat: 787.2 kcal / 9 kcal/g = 87.5 g