How do I lose 40 punds in 1 month?

i have this diet that supposedly helps you lose around40-50 pounds in a month.I tried it for a week and lost 10 pounds, but you get seriously hungry and it’s a chemical diet so son’t do it for more than 1 month and try to exercise so you don’t lose muscle too.

Breakfast (same every day)

-Half grapefruit or an orange -2 boiled eggs

• Black coffee or tea

Day -1 type of fruit ( any amount )

            Dinner1  -grilled meat
                             -salad ( cucumber, tomatoes, lettuce, pepper)

day 2 Lunch - Chicken( grilled or broiled)

                                          -Tomatoes
                                         -1 grapefruit

                       dinner   -2 boiled eggs
                                        -toast
                                        -grapefruit

3 lunch -light cheese

                                       -toast
                                     - tomatoes 

                  dinner-     grilled lean meat

4 lunch -1 type of fruit ( any amount)

                  dinner  -grilled meat
                              - salad

5 lunch -2 boiled eggs

                                  -sauté    


                 dinner    -grilled fish or tuna
                                 -salad
                                - grapefruit

6 lunch - 1 type of fruit

                dinner         -grilled meat
                                       -salad

7 lunch -Grilled chicken

                                -sauté
                                 -tomato
                                 -1 grapefruit  

                 dinner       -sauté

Repeat for 4 weeks

Weigh yourself after first 15 days then in the end