Besides weighing yourself also take your waist measurement. See if there is a reduction. Your initial weight loss is most probably due to loss of fluid (water) from your body. Usually happens at the beginning of a cleanse.
Do not mix veggies and fruits when juicing. In fact even drinking fruit juice should be separated from drinking vegetable juice by at least half an hour. Also dilute all your juices with 50% water. Drink only one 8oz glass of diluted fruit juice twice a day, once in the morning then a second one in the afternoon.
Enrich your vegetable broth with potassium by simply adding the peel of one or two large baking potatoes. Make sure that you wash the potatoes very thoroughly then peel 1/4 inch of them, put the peel in the broth and cook until tender.
I have only fasted once in my life to loose weight. I am usually under weight. My fast were mainly to improve my health. When I go on a juice fast, I always start with a complete cleanse of my bowels (takes 3 days) then cleanse my small intestines (1 day) followed by a liver cleanse (daily for the rest of the fast).
Bowel cleanse take cleansing enemas morning and evening. Small intestines cleanse do a salt water flush. Liver cleanse daily coffee enema.
With a caloric intake of 1200 to 1400 your weight loss will be slow, which is good, so you must not get discouraged.
Please read my blog titled "My challenge", link below.