Why Do We Have Food Cravings?
One important factor which may influence appetite control is the notion of food cravings. This overwhelming urge to consume a particular food appears strong in overweight dieters, and many theories has posited why this is so toto-my. The nutritional and homeostatic role of food cravings is described by physiological theories and explains why cravings might be more present in people who are deprived of food. The psychoactive abilities of certain foods to trigger cravings are likened to a self-medication behaviour and thought to relieve a central serotonin deficits. Psychological theories stress the role of negatives emotions (e.g. anger) as triggers for cravings and learning theories claim that cravings are a positive learnt response to cues (sensory, situational) and giving into a craving results in a pleasurable consequence. What is evident here is that food cravings are a multi-dimensional and complex occurrence, one which possibly involves aspects of all of the proposed theories.
Whatever the reason, it is suggested that food cravings frequently lead to consumption of the craved food and elevated Body Mass Index is associated with food intake and preference for high fat foods. Even in non-clinical samples, food craving has been found to be related to body weight, suggesting the significant role of craving in food consumption. Early identification of elevated body mass indexes (BMI), medical risks, and unhealthy eating and physical activity habits may be essential to the future prevention of obesity. One crucial question is the role food cravings may play in maintaining excessive eating patterns observed in other problems with eating behaviours: binge eating, bulimia, and obesity.
Food Cravings and Weight Gain: The Missing Link
There is thorough and outstanding evidence regarding the increase in worldwide rates of obesity and the projected outcomes if this is not addressed. Children in particular are noted as being especially at risk of future long term health problems. While dietary restraint, more nutritious eating habits and physical exercise have always been purported to be the answer to the obesity crisis in adults, adolescents and children, long term meta analysis and follow-up studies indicate that weight loss is not maintained (and indeed the more time that elapses between the end of a diet and the follow-up, the more weight is regained). Unfortunately, several other studies indicate that dieting is actually a consistent predictor of future weight gain.
A recent study conducted by Patricia Goodspeed Grant (2008) involved investigating the psychological, cultural and social contributions to overeating in obese people. She found that eating for comfort for the morbidly obese is rooted in using food to manage experiences of emotional pain and difficult family and social relationships. Her participants reported that what had been missing from all treatment programs they had tried was the “opportunity to work on the psychological issues concurrently with weight loss”.
It appears that a missing link in the treatment of overweight and obesity is this concept and issue of addressing the psychological contributors or emotional drivers that are leading people to overeat. Relying on willpower and education is clearly not enough.
Humans are only motivated by feelings (i.e. sensations). There are basically three types of feelings; pleasant, neutral and unpleasant. The motivation we get from the unpleasant feeling is to move towards a feeling we do not have, but do want. We move away from the unpleasant feeling by replacing it with a different pleasant (or neutral) feeling.
Hunger, is an unpleasant sensation (for most people) and is relieved by the pleasant sensation (for most people) of eating and the taste of food. Like other basic functions, this is so that we can survive, individually and as a species. Most of us prefer pleasant sensations over unpleasant sensations. But pleasant sensations are not always matched with the outcome that they were designed for. Many people eat, not because they need nutrition, but because they feel an unpleasant emotion, like rejection, loneliness, distress, depression, fear, betrayal, worthlessness, defeat, helplessness or hopelessness. This emotional over-consumption of food often leads to fat-gain and other health problems. This can then create a vicious cycle of more emotional eating to manage the emotional consequences of becoming overweight and unhealthy.
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