--Waldir
Excerpt:
...But the psychological changes that were brought on by dieting, even among these robust men with only moderate calorie restrictions, were the most profound and unexpected. So much so that Dr. Keys called it "semistarvation neurosis." The men became nervous, anxious, apathetic, withdrawn, impatient, self-critical with distorted body images and even feeling overweight, moody, emotional and depressed. A few even mutilated themselves, one chopping off three fingers in stress. They lost their ambition and feelings of adequacy, and their cultural and academic interests narrowed. They neglected their appearance, became loners and their social and family relationships suffered. They lost their senses of humor, love and compassion. Instead, they became obsessed with food, thinking, talking and reading about it constantly; developed weird eating rituals; began hoarding things; consumed vast amounts of coffee and tea; and chewed gum incessantly (as many as 40 packages a day). Binge eating episodes also became a problem as some of the men were unable to continue to restrict their eating in their hunger.
The act of restricting food and the constant hunger "made food the most important thing in one's life," said one of the participants. "Food became the one central and only thing really in one's life. And life is pretty dull if that's the only thing. I mean, if you went to a movie, you weren't particularly interested in the love scenes, but you noticed every time they ate and what they ate."
These experiences are familiar to those who've spent their lives dieting. In fact, many of the symptoms once thought to be primary features of anorexia nervosa are actually normal biological responses of undernutrition and restrictive eating. It was actually Dr. Keys' research that first evidenced the role of dieting in increasing risks for eating disorders.
The extreme physical and mental effects Dr. Keys observed led to his famous quote: "Starved people cannot be taught democracy. To talk about the will of the people when you aren't feeding them is perfect hogwash." This was also what led early feminist activists to see dieting and weight concerns as a way to keep women preoccupied with food, filled with guilt and self-hatred, more easily influenced by others, and too mentally and physically exhausted to succeed professionally and politically.
The aftermath
The last part of the Minnesota Starvation Study revealed perhaps the most important effects. When the men were allowed to eat ad libitum again, they had insatiable appetites, yet never felt full. Even five months later, some continued to have dysfunctional eating, although most were finally regaining some normalization of their eating. As they regained their weights, their suppressed metabolism and energy levels returned, although even three months after ending the diet none of the men had yet regained their former physical capacity, noted Dr. Keys.
While it seemed the men were "overeating," Dr. Keys discovered that their bodies actually needed inordinate amount of calories for their tissues to be rebuilt:
Our experiments have shown that in an adult man no appreciable rehabilitation can take place on a diet of 2,000 calories a day. The proper level is more like 4,000 kcal daily for some months. The character of the rehabilitation diet is important also, but unless calories are abundant, then extra proteins, vitamins and minerals are of little value.
In other words, they weren't really "overeating," it was a biological, normal effect of hunger and weight loss. The men regained their original weights plus 10%. The regained weight was disproportionally fat, and their lean body mass recovered much more slowly. With unlimited food and unrestricted eating, their weights plateaued and finally, about 9 months later, most had naturally returned to their initial weights without trying — giving scientists one of the first demonstrations that each body has a natural, genetic set point, whether it be fat or thin. Despite the fear that with unrestrained eating everyone would continue to grow larger, it isn't true.
As Dr. Garner explained:
One of the most notable implications of the Minnesota experiment is that it challenges the popular notion that body weight is easily altered if one simply exercises a bit of "willpower." It also demonstrates that the body is not simply "reprogrammed" at a lower set point once weight loss has been achieved. The volunteers' experimental diet was unsuccessful in overriding their bodies' strong propensity to defend a particular weight level. Again, it is important to emphasize that following the months of refeeding, the Minnesota volunteers did not skyrocket into obesity.
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