3) 導入期（約2-6週間）を終え脂肪酸ケトン代謝に適応して以降、カロリー制限するか否か、するとしたらどの程度か？
Lyle McDonaldの提案は、TDEE（活動代謝）の10-20%削減程度、これより減らすと代謝縮小と筋量減少を招くため推奨できない としています。

筋量維持と体脂肪減量を目指すpracticalな立場から、Lyle McDonaldの意見（著書"The Ketogenic Diet" p99より）

As a rule of thumb, to avoid metabolic slowdown calories should be initially decreased 10-20% below maintenance for fat loss.
This can be accomplished by either decreasing caloric intake, increasing activity, or some combination of the two.
Repeated body composition measurements will indicate if less or greater caloric intakes are necessary to optimize fat loss.
In general, a fat loss of 1 to 1.5 lbs per week should ensure that no muscle is being lost.
A total weight loss of greater than 2 pounds per week (not counting water weight) indicates that some muscle is being lost and calories should be increased.

急いで痩せたい人には物足りないかもしれませんが、これが穏当かつ妥当な、現実的な数字です。