Your normal weight                                                   
Your desirable weight

Your minimum daily protein requirement=
  desirable weight (pounds) x 0.5
Your minimum daily calorie requirement=
  desirable weight (pounds) x 18 (men)
  desirable weight (pounds) x 16 (women)
Keep a daily record of your weight
  (and your protein and calorie intake)

If you are losing weight,  increase your protein and calorie intake to:
protein grams=  desirable weight x 0.7=
calories:  desirable weight x 20 (men)=
calories:  desirable weight x 18 (women)=