An Examination of Dietary Influences
on Delinquency
Kevin R. Clark
Missouri Western State College
December 5, 1995
Abstract
A sample of undergraduate psychology students were surveyed in
order to determine if their quality of diet consequently influenced
their self-reported levels of delinquency. Fifty-five students
were surveyed, using both Schauss' Nutrition-Behavior Inventory and
a modified version of the Short-Nye Self-Report Delinquency Scale.
Subjects' nutrition scores and delinquency scores were then
subjected to statistical analysis to determine if any degree of
correlation existed. Contrary to the hypothesis, a Pearson
Correlation did not reveal a significant relationship between diet
and delinquency, r(55)=.0814, p>.05. Despite the
lack of significance in these results, this should definitely be an
area of interest for future research. This lack of significance
can partly be attributed to the ambiguity of the questionnaires
used and should, in no way, diminish the significance of numerous
dietary findings which have been found to be applicable to the
delinquent/antisocial individual.
Introduction
The war on crime has generated extensive research into the field of
Criminology and the various strategies for reducing criminal
behavior. While most of the behavioral scientists believe that
criminal behavior is primarily learned, others claim that biosocial
factors can be applicable in the treatment of criminals and
juvenile delinquents. This claim led to a relatively new approach
in corrections, primarily during the 1970s. This approach involves
the attempt to reduce antisocial behavior by changing diet. While
the overall impact of diet upon crime and delinquency may not be as
powerful as traditional psychological variables, the dietary
approach is far more practical since diet can be altered rather
easily and inexpensively.
Researchers interested in these biosocial/biomedical approaches to
offender rehabilitation have identified at least six primary
syndrome areas. These areas include: (1) hypoglycemia, (2)
vitamin and mineral deficiencies or dependencies, (3) cerebral
allergies and addictions, (4) environmental contaminants, (5)
minimal brain dysfunction, and (6) neuro-regulator imbalances
(Schoenthaler, 1983a). After extensive analysis of the literature
in these six areas, Hippchen (1976), Schauss (1980), and
Schoenthaler (1982) came to the conclusion that hypoglycemia -
induced by a diet which is high in sugar and/or refined
carbohydrates - may account for the largest proportion of
antisocial behavior which can be controlled by diet.
Hypoglycemia, or low blood sugar, can be caused by a variety of
conditions such as endocrine system malfunctions, adverse reactions
to a particular food, and the consumption of high quantities of
sugar. While hypoglycemia is often caused by physiological
problems, research suggests that poor eating patterns are the
primary cause of low blood sugar (Schoenthaler, 1983a).
As Schoenthaler (1985) clearly illustrates, the link between
violence/delinquency and hypoglycemia can be grounded in basic
human physiology. First of all, blood sugar (glucose) is the only
nutrient which the brain can convert into energy. As glucose
levels fall, the available brain energy will fall correspondingly,
due to impaired neuronal firing. Therefore, due to diminished
brain functioning, people with low blood sugar would have a lowered
capacity to think clearly before acting and may have difficulty
controlling their violent emotions.
As Schauss (1980) points out, many such biochemical disturbances
can be attributed to our modern day diet of junk foods. In 1971,
the United States had the "distinction" of becoming the first
people on earth to consume processed foods for more than 50 percent
of their diet. Over 4,000 additives can now be found in the
American food supply, none of which have ever been tested
thoroughly for their effects on our central nervous system
(Schauss, 1980). We have become a nation of coffee and soda pop
drinkers, fast food consumers, and refined carbohydrate junkies,
without regard to their disastrous consequences, particularly on
our children. Less than 50 years ago hyperactive children were a
rarity. Today the incidence of hyperactivity and learning
disability is higher in the United States than in any other country
in the world (Schauss, 1980).
In support of the diet and delinquency hypothesis, several studies
have successfully shown reductions in antisocial behavior by
reducing sucrose consumption in numerous juvenile correctional
institutions. In fact, as of 1983, at least nine separate
institutions in three states had found that the behavior of their
juveniles improved significantly after the elimination of high
sugar "junk foods" in scientifically controlled studies
(Schoenthaler, 1983b). In one study, for example, Schoenthaler and
Doraz (1983) found that during the 12 months when the juveniles
received a nutritionally superior diet, the incidence of assault
was lowered 82%; theft was lowered 77%; general rule violations
were lowered 23%; and fighting was lowered 13%.
From the vast amount of literature on the subject, one can safely
theorize that a definite relationship exists between diet and
delinquency, although the degree of this relationship may be quite
arguable. It is this gray area which this paper will focus upon.
While numerous experimental procedures have been carried out in
correctional institutions, there seems to be little or no data
relating to how accurately and consistently a poor diet will
correlate with delinquent/antisocial behavior in the general
population. Thus, the purpose of this paper is to determine the
extent to which individuals with poor nutrition consequently
exhibit delinquent/antisocial tendencies.
Methods
Subjects
For this study, I surveyed fifty-five undergraduate psychology
students at Missouri Western State College in St. Joseph, MO. Data
were collected from both males and females. The vast majority of
subjects were traditional age college students (18-25 years), but
the non-traditional students were included as well.
Materials
Subjects were surveyed using Schauss' (1980) Nutrition-Behavior
Inventory and a modified version of the Short-Nye Self-Report
Delinquency Scale (Nye, 1958).
Procedure
I first administered the Nutrition-Behavior Inventory to all
subjects, in a classroom setting. I then administered the Self-
Report Delinquency Scale to the same subjects, on a subsequent day.
The surveys were given at different times in order to minimize
demand characteristics which might influence the subjects'
responses. Therefore, each survey asked for the last four digits
of the subject's Social Security Number for identification
purposes. Each subject's Nutrition survey was then accordingly
paired with his/her Delinquency survey.
Scores were then tabulated for each Nutrition-Behavior Inventory.
Those subjects scoring over 50 were considered to have
nutritionally linked factors affecting their health and behavior
and, therefore, considered to have a generally poor diet. A
delinquency score was then assessed for each subject. Thus, each
subject had both a nutrition score and a delinquency score in the
final analysis. These scores were then correlated to determine the
extent to which the subjects' diets influenced their degree of
delinquency.
Results
The data from this study resulted in a simple correlational design.
The data for all subjects underwent statistical testing to
determine the Pearson Correlation. The correlation was not found
to be significant, r(55)=.0814, p>.05. Therefore,
the quality of subjects' diets, as measured by the Nutrition-
Behavior Inventory, was not found to be significantly correlated
with subjects' self-reported levels of delinquency.
Discussion
Because there was no statistical significance found between diet
and delinquency, we cannot conclude, in this case, that the quality
of subjects' nutrition influenced their self-reported degrees of
delinquency. One obvious limitation of the study is the ambiguity
of the questionnaires used to measure both nutrition and
delinquency in subjects. Schauss' Nutrition-Behavior Inventory,
for instance, merely purports to measure whether an individual has
nutritionally linked factors affecting his or her health and
behavior. While a high score on this inventory may indicate the
likelihood of a generally poor diet, it is not entirely conclusive.
Likewise, the delinquency survey's ambiguity is apparent in the
fact that, foremost, it is a self-report method of measurement and,
secondly, it asks for the frequency of delinquent acts ever
committed in the subject's lifetime, as opposed to concentrating on
a current level of delinquency.
Despite the low degree of correlation found in this study, research
should continue to examine the possible dietary influences on
delinquency. Perhaps a future study might yield significant
results if it were to use a more definitive measure for the quality
of subjects' diets. Future research should also focus on the time
factor involved, insuring that subjects' present-day quality of
diet is examined with regards to their present-day delinquency -
not delinquent acts that may be years old and which have not been
repeated since. Research should also be continued with regards to
reductions in delinquent/antisocial behavior which have been
demonstrated in correctional institutions, especially juvenile
institutions. The results of this study, from a sample of
undergraduate psychology students, in no way diminishes the
significance of the numerous findings which have been found to be
applicable to the delinquent/antisocial individual. Adjustments in
diet have proven beneficial for many such individuals and could,
undoubtedly, benefit many others who are, unfortunately, naive to
such possibilities.
References
Hippchen, L.J. (1976). Biochemical approaches to offender
rehabilitation. Offender Rehabilitation, 1, 115-123.
Nye, F.I. Family Relationships and Delinquent Behavior. New
York: Wiley, 1958, 13-14.
Schauss, A.G. Diet, Crime, and Delinquency. Berkeley: Parker
House, 1980.
Schoenthaler, S.J. (1982). The effect of sugar on the treatment
and control of antisocial behavior: A double-blind study on an
incarcerated juvenile population. International Journal of
Biosocial Research, 3, 1-9.
Schoenthaler, S.J. (1983a). Diet and crime: An empirical
examination of the value of nutrition in the control and treatment
of incarcerated juvenile offenders. International Journal of
Biosocial Research, 4, 25-39.
Schoenthaler, S.J. (1983b). The effects of citrus on the treatment
and control of antisocial behavior: A double-blind study of an
incarcerated juvenile population. International Journal of
Biosocial Research, 5, 107-117.
Schoenthaler, S.J. (1985). Diet and delinquency: Empirical testing
of seven theories. International Journal of Biosocial Research,
7, 108-131.
Schoenthaler, S.J., & Doraz, W.E. (1983). Types of offenses which
can be reduced in an institutional setting using nutritional
intervention: A preliminary empirical evaluation. International
Journal of Biosocial Research, 4, 74-84.
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