You’ll notice we’ve provided you with a suggested macronutrient split on your app home screen. We’ve generated these numbers using a standardised method called the Mifflin St-Jeor equation, as well as factoring in some variables like your training split and training goal.
We need to remember that these figures are not concrete. They are there to be used as a ballpark number to get us on the right track. Think of this number as a start point, and from there, we can begin to adjust if needed through some guided self-experimentation and feedback.
So if you’re interested, here’s how we landed on your magic protein requirement number. To make it easier to understand, we are going to show you the same process we used for your guidelines on our old friend Joseph Blogovich as an example using some arbitrary data:
Using the Mifflin St Jeor equation, we know Jo’s BMR is ~1,845 Kcal.
We then calculate Jo’s maintenance calories by attaching the unique number (1.375) to his training split, which he told us was three days/week. We then use this to multiply his BMI.
1,845kcal (BMI) x 1.375 = 2,536kcal (maintenance calories)
It’s muscle build, so we factored in a relatively sustainable calorie surplus of +350kcals to get our total daily calorie intake of 2,886kcal
After all of that, we then distributed Jo’s total daily calories (2,886kcal) across a standardised macro split of:
30% protein – 40% carbohydrate – 30% fats.
We then take Jo’s total daily calorie intake (2,886) and times that by 0.30 (the percentage of calories we allocated to protein in the above step) to establish how many actual calories of protein we want to consume.
2,886 x 0.30 = 866kcal of protein.
Finally – we now know that Jo needs 866 kcal/day of protein to help support his goal of building muscle. To get that into grams we need to divide 866/4 (the amount of kcals in a single gram of protein)
This gives us a magic number of 216g of protein/day.
Just to throw a spanner in the works, you will normally see protein requirements displayed as grams per kilogram of body weight (g/kg). This is slightly different from the calculation we have just performed which is based on calorie intake.
For individuals that are a healthy weight and engaging in regular resistance training, consuming between 2-2.5g/kg BW of protein per day has been shown to support the development of lean muscle mass.
If we apply this to our friend Jo who is 90 kg’s we would be looking at a minimum intake of 180g/day and an upper limit of 225g/day.