E=C+F+P; simple algebra and elementary logic
Let E stand for the amount of energy the body needs;
let C, F, and P stand for (respectively) carbohydrates, fats, and protein;
E=C+F+P;
If E remains constant or increases, and C decreases, then either F or P or both
F & P must increase.
Algebra wasn’t my best subject in school, but I do remember this much.
Hence, if we lower our carbohydrate intake, we must increase our intake of fats
and/or proteins. By how must the former is decreased and by how much the latter
is/are increased will vary from person to person, of course, but the principle
endures. As the header says, simple algebra and elementary logic tell us this.