Well that is more a report than a study, but that is pretty interesting, saving that.

Though 3500 and 3200 seem absolutely fucking wild to me. I am a 184cm, 96kg (not fit anymore but used to work out 6 days a week for 2-3hrs) and if I eat more than 2200 per day not-active (I got used to weighing every gram of food during cuts) I gain weight. I find it hard to believe that 3500 and 3200 was average then as there were significantly less obese people then.