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    Thanks for the wildly different perspective. On the other hand, my book from the 1960s it talking about a 2500-2900 calorie diet to maintain weight. And then it talks about needing a 4000+ calorie diet to climb mountains.
    – Joshua
    Commented Nov 27, 2017 at 16:30
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    @Joshua not knowing the context of that messaging, I can't speculate. Did it also mention 4-4-3-2 and the importance of dairy? A lot of that 60s era messaging was "highly influenced" by the food industry. Here's a modern view, which points out how dramatically it shifts for people of different genders, ages and lifestyles. What's more, so many Americans are overweight, and if so, the general advice is to reduce calories by another 500. Commented Nov 27, 2017 at 18:20
  • Mountaineering: The Freedom of the Hills. It included office job calorie consumption as a baseline. It does not include the nutrition source spread in that case.
    – Joshua
    Commented Nov 27, 2017 at 20:05
  • From a British perspective, our National Health Service guidelines say 2,500 / 2000 calories. But that seems to assume a moderately active lifestyle. Which of course is not the case for most people. I too have read about and noticed portion sizes increasing, as well as sugar content of foods, which has caused the rapid increase in obesity and diabetes. But if you go to a culture where they don't have that; anywhere in Scandinavia, Poland, etc... you really notice the absence of obese people. Portion sizes in restaurants are smaller too.
    – user1923
    Commented Nov 28, 2017 at 11:58