Are you saying you broke your fast and then on the same day:
had a small salad (about 1 cup) with about 2tblsp. of dresisng. Later I had a couple slices of ham and a diet root beer (I was dying for a root beer). Around 3:30 today I had a low carbohydrate tortilla and a lot of romaine lettuce and red bell pepper with horseraddish sauce.
If so, then yes, that's too much for the breaking of a fast... too much as in the type of foods you're choosing to break your fast on. The ham, tortilla and diet soda, are bad foods to eat no matter if you're breaking a fast or not, because they are dead processed foods with no nutritional value at all. Here is a link that explains breaking a fast: http://curezone.com/blogs/m.asp?f=573&i=51
If I had a choice between eating high carb with strong nutritional value and a low carb dead food, I'd choose the high carb hands down. But I eat primarily raw and juice, so I don't need to agonize over such a choice.
Firstly, you need to decide why you are fasting in the first place. Many people erroneously see fasting as primarily a modality for losing a large amount of weight rapidly, when in fact, the weight loss from a fast is merely a by-product and not the primary purpose.
The primary purpose of juice fasting is to detoxify the body so the body can heal, rebalance, rebuild, rejuvenate. The weight loss is secondary to that. So, when you break a fast with a diet soda (or any kind of soda) and processed meats (and foods) you are just tearing down what your body just rebuilt. That's what will put stress on your body and metabolism.
You can fast for five days, go off the fast for a week by eating raw fruits and veggies and then go back on the fast for another five days or a week or however long, come off, eat fresh raw foods and so on and not stress the body the way eating bad processed foods can stress and tear up the body.
If you want to experience the juice fast, you need to get a juicer, bottom line. You need a juicer so you can juice all the hard veggies and fruits, such as apples, carrots, beets, pears and so on. Juicers separate the pulp from the juice because you can't drink the pulp on a juice fast. There are many good, reasonably priced juicers out there. (I just ordered a Lexen myself, to replace my trusty Juiceman II) A juice fast comprises green veggies as well as the fruits...
Many people, including myself, prep ourselves for a juice fast by eating raw fruits and veggies for a three or four days prior to the fast proper. I don't believe low carb diets matter, any more than a bad SAD high carb diet matters as to whether or not one should juice fast. Juice fasting isn't about carbs... it's about alkalizing the body with raw live juices and shutting down the digestive system, thereby allowing the body to detox, rebalance and heal.
Yes, one can lose a lot of weight on a juice fast... as much as 1 to 2 pounds a day (and even more), depending on how much you need to lose. The more you need to lose, the more weight you'll drop. The less you need to lose, the less weight you'll drop per day. I've lost 30 pounds in 30 days. I've known people to lose 50 pounds in 30 days on a sustained juice fast. And some who've lost less than 30 pounds in 30 days. As always, it depends upon the person, their body and circumstances.