Revisiting Taubes' Four Facts from the Sixties

In Good Calories Bad Calories, Gary Taubes wrote the somewhat shockingly definitive summary paragraph below (I've separated out the numbered statements for clarity):  

By the mid-1960s, four facts had been established beyond reasonable doubt:

(1) carbohydrates are singularly responsible for prompting insulin secretion;

(2) insulin is singularly responsible for inducing fat accumulation;

(3) dietary carbohydrates are required for excess fat accumulation; and

(4) both Type 2 diabetics and the obese have abnormally elevated levels of  circulating insulin and a “greatly exaggerated” insulin response to carbohydrates in the diet, ... (Kindle Locations 8010-8014)

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