I'm with Jewels - 20 is way low, but also depends on the length of time you stay there, your goals, and how the numbers change the subsequent weeks.
Also, does the carb count deduct fiber? If a veggie has 10g of carbs, but 4g of fiber, the ammount of carbs that actually has any metabolic impact is only 6g.
Most programs that cut your carbs way low for a long period of time deplete the glucose stores in your body (hence the brain fog - the brain is a glucose machine). Yes your body turns to alternate forms of fuel (aka fat) to create more, but it's not as efficent (ie your brain isn't as happy with that source as it is from food).
It also can trigger mad cravings because your body is trying to force you to give it what it needs/wants.
The beauty of cycling is you keep your carb count lower for a few days, relying primarily on veggies (& the occassional fruit & grain) for your carbs, then you throw in a high carb/high grain day to replenish the bodies stores, stoke the fire a bit, then drop the carbs back down.
It also helps you function in the 'real world' without going /too/ crazy. :)
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