I'm only going to be an abrupt ass because I'm sure someone else will link to something or explain a bit further:

1.) Paleo and low carb are not one in the same. I think I'm going to use the terms "ancestral" and "traditional" from now on.

2.) Low carbohydrate diets are not inherently dangerous, but Matt Stone is inherently stupid.

With that said, there is significant evidence that prolonged low carbohydrate dieting will lower T3 levels. I personally have no intention to restrict my carbohydrate intake intentionally again. I thrive on mounds of potatoes, fruit, and rice; plus, I enjoy sports, cycling, and running, all of which are not optimized on a low carb diet. To each their own, your mileage may vary, everyone is a unique snowflake, bunnies and unicorns, etc., etc.

Cheers.

Low carb doesn't hose your metabolism. My own personal experience is that it restored my metabolism to health. It healed my insulin resistance. It allowed me to lose weight. It restored my hunger/satiety signals to normal. It gave me more energy. It turned me from a sluggish metabolism and slightly hypothyroid to brimming with energy. I started low carb and still am around 100g a day and have never felt warmer, more active, more healthy, more alert, more happy, stronger, fitter and more energetic in my life. I see no reason to specifically increase or manipulate my carb intake. I just eat what I like, which is mostly meat and vegetables, sweet potatoes and yams, avocados and dates and not very much fruit, but a little bit.

Without lending credence to Stone's claims, let's clear up that his primary contention is that low carb diets have negative effects on metabolism and the thyroid. Going paleo does not, in my mind, suggest anything of a person's total carb intake.

How could eating natural, whole foods wreak havoc on any system? This is utter nonsense. Also, Paleo DOES NOT EQUAL LOW-CARB! You can eat plenty of grainless carbs on Paleo. Some people eat rice and sprouted grains. If you eat things that you can't digest (for some it's dairy, for others, it's nightshades), your digestive system will suffer and you'll feel crappy.

Quote from that website (particularly offensive and unprofessional bits bolded by me):

"This is just an annoying and frighteningly Orwellian attempt to fix a problem by doing what we know doesn’t work. Good job retards. If you want to play around with other people’s food, I recommend getting jobs at McDonald’s where you belong. They have salads and apple slices there now. Oh but you won’t. Next thing I know I will have a tired, hungry, and irritable obese Girl Scout on a low-calorie diet at my door with freeze dried broccoli florets for sale. I hope my hands are well-washed from my last tasty meal. I might lose a finger!"

I see no reason to take this jerk seriously. I mean, I'm not saying I'm the nicest person in the world, and I did just call him a jerk, but I am not writing on a blog that is supposed to educate and help people. If educating and informing was my goal, then I would play nice, be professional, and present the facts.

Paleo and low-carb are different animals, although they get bunched together quite often. I consume between 2500 and 3000 Kcal per day with 50-200g of carbs in there, depending on the day. I stick with safe carbs like sweet potatoes, squash, occasionally rice, and I have never felt better. I also exercise daily, mixed between high intensity and low intensity, and have constant energy. I eat between 1 and 3 times per day, and NEVER snack. My energy is so consistent that I don't need to snack.

I personally think that VLC is bad, certainly in the long run, but luckily paleo isn't low carb

Speaking from personal experience, eating low-carb Paleo has put my T3 count below normal. Even though I lost a ton of fat initially, it's hard to keep it off now even though I lift weights 4-5 times a week. I believe low carb has screwed up my metabolism. I'll be adding potatoes and rice back into my diet from now on.

Why does anyone listen to Matt Stone- he tells you to eat sugar and refined carbs! He is totally crazy in my opinion.

low carb for me equals garbage metabolism. never been overweight, only did it for the health 'benefits'. yeah right. felt great at first, but after a good 6 mos. or so...stay back! i was a mess. grouchy, losing hair, nervous, cold, almost lost my period (was getting later and later), bad breath, poor digestion, NO libido etc. i could list lots more, but i think y'all get the point. matt stone may be a 'jerk' or whatever, but he saved my ass. paleo is cool and all for introducing whole foods/grass-fed meats, but dude! it's easy to go low carb w no grains/sugar. i gotta eat phd style w plenty of fruit now or all those nasty low metabolism symptoms come right back. be careful!!