Reasons why your diet is not working

FOR IMMEDIATE RELEASE
(Free-Press-Release.com) July 5, 2010 -- While New Year dieting advice abounds, why do so many of us still struggle with our weight? Even if we lose a few Christmas induced pounds we still find it difficult to keep the weight off.

In a quest for answers, Natures Remedies Ltd, sponsored leading eating behaviour scientists at University of Liverpool to review the scientific literature on the effects of calorie restrictive diets*. It is recognised that controls impacting on eating behaviour at the metabolic, hormonal and physiological levels are highly complex and not completely understood. However, studies are pointing to the ‘eating hormone’ leptin as playing a significant role. During dieting, serum leptin levels have been shown to decrease thus signalling a need for increased food intake.

The resulting report examines the consequences of calorie reduction on appetite and on resultant psychological and metabolic changes. The University of Liverpool review highlights eight key dieting limitations:

EVOLUTION

Avoiding starvation was a key evolutionary factor for early Homo sapiens. A review of key scientific literature indicates that as we reduce our calorie intake our body and brain fight back in an attempt to sustain good nutrition.

In the past this enabled storage for times of shortage but today we are unfortunately not programmed to lose weight when food is freely and permanently available, especially when we are sedentary with no need to expend energy in obtaining food.

AS WE LOSE WEIGHT OUR APPETITE INCREASES


Both human and animal studies support the anecdotal evidence from dieters and clinicians that calorie restriction results in a compensatory increase in appetite as the body fights to reverse the process.

AS WE DIET OUR BODY USES FEWER CALORIES IN SUSTAINING ITSELF

Physiological studies show that in an attempt to compensate for reduced calorie intake our basal metabolic rate decreases so that the body actually uses less calories to sustain itself.

INCREASED PREOCCUPATION WITH FOOD

Published research indicates that dieters have a greater pre-occupation with food, stronger urges to eat more frequently and a greater feeling of being out of control with their eating.

IMPAIRED COGNITIVE FUNCTION AMD DEPRESSION

Psychological studies indicate that dieters have impaired cognitive function and slower reaction time compared to non-dieters. Increased depression has also been observed in dieters.

POOR RESTRAINT

Research also demonstrates that dieters find it hard to control their appetite after exposure to appealing energy dense foods. This can lead to abandonment of dietary resolve and provoke over-consumption.

METABOLIC CHANGES

Endocrinological studies indicate that dieting reduces the secretion of hormones that help to control food intake. Falling levels of hormones such as leptin may contribute to diet failure.

SUMMARY

The authors conclude that for dieters, increases in hunger and decreases in metabolic rate cause real barriers to success. They make a case for nutritional strategies that both:

- prevent overfeeding by enhancing within-meal satiation and post meal satiety

- stimulate metabolic rate to compensate for reduction induced by lower caloric intake'

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