Just the basics bmr. Depending on activity level add subtract calories.
Then depending on goals e.g lose weight or gain weight add or subtract 500 cals on top of bmr.
If my maintenance is 2500 calories.
Then I know I can split the 2500 calories into macros
E.g 40%protein/40%carb/20%fat.
Alter the percentages based on sports specific goals
e.g/ muscle gain/maintenance/increase energy levels/decrease bloating ect.
1gram protein =4 cals
1gram carb = 4 cals
1 gram fat =9cals.
Reccomendations for muscle gain example is 1gram protein per kg bodyweight ect. Some take 2 some take 4 ect. Same principle with carb and fat.
Peds alter this again, same with fasting, keto ect.
More interested in nutrient profiles, surely they would have some valuable knowledge? If not will just have to figure it out, and bro science that shit