Is your Weight Loss slow, despite low Calorie / low fat?

For health and weight loss, the body can only process so much fuel or energy per meal. All Carbohydrate sources turn to energy or glucose to be converted to glycogen, the bodies fuel source.
Body Fat is a secondary stored energy source (the bodies preferred and primary source is Carbohydrate) 
So if the goal is to be leaner or to avoid illnesses such as diabetes, then Carbohydrate has to be moderated.
But different Carbohydrates have different amounts of fuel as illustrated above.
Vegetables contain very little fuel whilst you can see that in bread (and also Pasta, Rice, Potatoes and most cereals) that even a small amount contains a lot of fuel.
In the industry we tend to use the 30 grams of Carbohydrate maximum per meal advice as most servings are 30g and the average person (whom I'm yet to meet :))
can only process a maximum of 30 grams of Carbohydrate per meal.

If weight loss is the goal, this is one of the tips that will have the most effect, when it comes down to foods containing energy or fuel, what is not processed and used by the body goes into storage. How do we store our surplus energy? Body Fat!

So by moderating our energy intake each meal, we will not be storing.

Bottom line; have a big portion of Vegetables per meal but if you are trying to lose weight then rely on Vegetables mostly for your fuel or have very small portions of the high energy Carbohydrates.