as someone studying a nutrition degree, please try not to cut out certain foods or follow restrictive diet :,( it is not good and can affect your physical and mental health.
i assume you're speaking about losing fat, not just losing weight. one can be 54kg, have more muscle tone & be physically toned and the other can be 50kg have more fat tissue......
currently studying maintenance engineering and its crazy out here! currently having some campus classmate dramas