Here is an important note from the research about source of the benefits
of carbs:

"   researchers also found that "Associations were stronger for coronary
  deaths than for all events, with reductions in risk of 25 percent for
  cereal fiber and 30 percent for fruit fiber for each 10 gram per day
  increment," write the researchers. "In contrast, vegetable fiber was
  not associated with CHD incidence or mortality [death]."

Many of the low carb as sole factor in healthy diet folk would run
screaming from the room rather then consider consuming more carbs from
grains or fruits, but allow themselves only veggies.  Mention should be
made of the benefits being with low gi/gl sources of carbs.  For a normal
person having carbs as a substantual part of the diet should be no
problem, this is not a low carb diet.  If carbs are consumed in their
whole form and concentrated highly refined carb sources are minimal and
with all sources of carbs from low gi/gl sources.  People with metabolic
syndrom and/or diabetes need to eat less total carbs.  But again the
amount is to reach a certain insulin resistence/blood glucose goal;
especially the post meal levels of glucose.  Even with them, grain and
fruit sources allow the benefits of their fiber and other micronutrients
while still maintaing glucose goals.  Veggies are sources of good stuff
too and can be increased for the groups who need to moniter total carb
intake.  In the very same way, it is the sources of and kinds of fats that
make a difference in overall health status, less sat replaced with poly
and better still mono fats maintain or increase in those groups who have
to watch total carb intake.  Protein does not escape this approach either,
one study found for the same amount of protien consumed, overall health
results were more favorable when the source had more veggie sources then
animal.