Dieting and Weight Loss: Impact on Behavior, Mood, and Thinking

The effects of starvation on the mind and body.  

ID 69057865 © Mantinov | Dreamstime.com

Is it Starvation?

Unfortunately, for many who struggle with disordered eating, life revolves around dieting and weight loss: planning for meals, feeling guilty post-eating, thinking about food, dreaming about it, frequent weighing, body checking, and more. In many of these individuals, this food/weight obsession exists alongside a restrictive approach to eating. It may be chronic dieting, “clean” eating, fasting, cleansing… In some cases, the individual may also be underweight… or not necessarily severely underweight but at the low end of their body’s most “comfortable” weight range.

It is important to understand that role of weight suppression – the difference between the highest past weight and one’s current weight - in the cycle of preoccupation described above. A major study conducted many years ago, The Minnesota Starvation Experiment is a remarkable illustration of the impact of food restriction and weight loss on the human mind. It’s meaningful because the thinking and behavior of the experiment volunteers are strikingly similar to what we see in people with eating disorders or in those who have undergone significant weight loss.

The Starvation Study

Back in the 1940’s (post WWII) a scientist by the name of Ancel Keys launched an experiment in his quest to better understand the impact of starvation on the body and mind. Through careful selection, Keys recruited 36 young, male volunteers, each of whom he deemed physically and mentally robust and capable of tolerating a demanding research protocol. After a 12-week control period during which time the men consumed a varied diet designed calorically for weight maintenance, Keys reduced their calories by half for the starvation phase. Over the course of 12-weeks under this restricted condition, the men were observed.

The impact of their weight loss and limited food availability was profound.

Food Preoccupation

For the volunteers, the days began to revolve around meal times. The men dreamed about food, they fantasized about high calorie/high fat food items they couldn’t access. They spent much of their time talking about food, recipes, agriculture. They became agitated if the timing of the meal schedule was changed or if a meal was delayed. Some of the men reported experiencing pleasure just by watching others eat or smelling food.

Urges to Overeat

The men extended their eating experiences as long as they could, not wanting the pleasurable experience to end (note: the food served was actually tasteless, cafeteria food). With unlimited access to coffee and chewing gum between meals, many of the men chewed and drank constantly; up to 40 sticks of gum and 80 plus ounces of coffee each day. Any opportunity to gain access to food, meant that the men would binge eat, consuming thousands of calories in a seating.

Mood Symptoms

The mood and energy of the group quickly shifted. Where the men had once been a lively crew, discussing and debating politics, current events instead the men became single-mindedly focused on food. The men were irritable, anxious, withdrawn. A significant increase in anxiety and obsessive thinking was observed.

Distorted Self Image

Remarkably, in spite of their significant weight loss and skeletal appearance, most of the men did not see themselves as underweight. They actually viewed others in comparison as “fat.” Some of the men became preoccupied with their abdominal area, expressing discomfort with bloating, constipation, gas.

Getting Better

After six months of starvation and the loss of approximately 25% of their body weight, the men (or those who tolerated until the end) were observed through the re-feeding process. During the restoration phase of the experiment, Keys found that the men had extraordinary calorie needs – well over 4000 calories per day - in order to slowly restore weight.   A subset of the men were allowed to re-feed without a controlled protocol; these men engaged in extreme overeating.As the men restored their nutrition and weight, their behavior appeared to normalize. There did not appear to be any enduring health problems once the men restored.

A Few Take-Aways Regarding Dieting and Weight Loss

• The restriction of nutrition leads to a heightened interest in food and eating. So there is an “explanation” for why you or someone you care about may be overwhelmingly preoccupied with food.

• Over-eating may be a direct result of under-eating.

• Many features of anorexia are actually symptoms of starvation and resolve with re-feeding.

• Prolonged restriction of food negatively impacts mood. Restriction and weight loss may lead to an increase in anxiety symptoms and obsessive thinking.

• Inability to stick to strict diets is not because of a lack of willpower. There is a biological pull to maintain a consistent body weight.

Towards eating disorder recovery

Understanding that one’s distorted thoughts and behaviors may stem from the effects of starvation can actually be reassuring; it shifts the narrative from feeling flawed or weak to recognizing that your body and mind are responding to a state of deprivation. This perspective allows you to see that these struggles are not a reflection of character but rather a natural response to insufficient nourishment.

Acknowledging this connection underscores the importance of prioritizing nourishment, not just for physical health but for mental clarity and emotional stability. Realizing that these experiences are rooted in biological processes reinforces that recovery is not only possible but an essential pathway to reclaiming your physical and emotional well-being.