Set 2 macro nutrient targets (absolute) and have the third filled in automatically based on calories

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As an amateur bodybuilder, the way I think about structuring my eating is to set an absolute protein goal (usually 1g per 1lb lean body mass ~150g), an unsaturated fat goal (usually 60g), and then the rest of my calories can be spent however I want.

Many people think of protein and healthy fat as buckets that need to be filled up, rather than as a percentage of some total calorie target.

Currently the app has you set a calorie target, and then set percentages. The problem is when I want to reduce my calories but keep my protein and fat the same, I have to reconfigure both fat and protein using a trial and error method based on percentage.

I am wondering if anyone has suggested this feature before or if there are plans to add it? I think this alone would attract a lot of new users as the bodybuilding community often has to pay for apps that support something like this, despite the fact that it is a rather simple feature conceptually.

I am a developer but mostly just familiar with Python, so attempts to implement myself have been challenging. If another dev wants to collaborate to build this who is more familiar with flutter development or the app itself please reach out!