Wellness Family Dentistry

Sugar Coated Mind

June 23, 2020
Posted By: Magna Porterfield, Ph.D. (Psychologist)

Typically when we hear “You are what you eat,” we think of the link between diet and physical health. However, we now know that what we eat also has a powerful impact on our mental state. It is believed that as much as half of what we eat feeds our brain. It’s indeed quite a greedy organ! With this in mind, it is clear that diet can impact our thoughts, emotions, memory, self-control, and other aspects of mental functioning.

Sugar and the Brain
So, in comes sugar – the food that is craved and loved by many people. Unfortunately, this love is not reciprocal.

Over 100 years ago, a well-known health educator stated, “Sugar is not good for the stomach. It causes fermentation and this clouds the brain and brings peevishness (irritability, fretfulness) into the disposition.”1

When we ingest a lot of refined sugar – i.e., white sugar – the blood glucose level spikes and then rapidly declines. This leads to irritability, nervousness, and fatigue. Consuming too much of this type of sugar is comparable to injecting our bodies with a syringe full of this substance. The brain doesn’t function well when it receives glucose in this manner. A better way to get glucose to the brain is in a “time-released” fashion, which occurs when we consume complex carbohydrates such as fruits, legumes, and whole grains.

When I was being trained as a psychologist, the idea that sugar affects mental functioning was ridiculed by a number of my fellow students and even some of my professors. Several years after that, when I was in private practice, more than a few of my psychological colleagues also minimized the impact of sugar on the mental and behavioral disorders of their patients. However, this is something that can no longer be ignored, as there is increasing evidence that contradicts such thinking.

Sugar and Psychological Disorders
There is evidence that sugar is a culprit in various psychological disorders. In one study, Dr. Malcolm Peet, a British psychiatric researcher, conducted a cross-cultural analysis of the relationship between diet and mental illness. He found a strong link between high sugar consumption and the risk of both depression and schizophrenia.2

Other experts state that refined sugar is linked with depression because it does not supply many nutrients and may also deplete B vitamins that are essential for proper nervous system functioning. In my work with depressed individuals, it was not uncommon for many of them to have sugar cravings and consume large amounts of refined sugar. They would often report that this made them “feel” better, at least temporarily. There is a physiological explanation for this – in short, sugar consumption is related to the synthesis of serotonin, which is a mood-regulating neurotransmitter. But, when refined sugar is ingested, the “feel good” effect is only short-lived because of other destructive mechanisms that take place thereafter (which we will not address in this article). This, in turn, makes the depressive symptoms worse. Interestingly, when I worked with individuals who had these sugar cravings, I would encourage them to consume omega-3 and many of them reported that their cravings decreased or eventually stopped.

And what is sugar’s role in ADHD/ADD? There is no clear scientific evidence that its consumption can lead to problems with attention, hyperactivity, or any other symptoms of this disorder. However, the observations of many lay persons (and even some health professionals such as myself) reveal that when children consume considerable amounts of refined sugar, they appear to become more hyperactive, distractible, and even aggressive. Thus, even though the empirical evidence is lacking, as a mental health practitioner, I still encourage parents to eliminate refined sugar, in all its forms, from the diets of their children.

Sugar Addictions

In her book “Potatoes Not Prozac,” Dr. Kathleen DesMaisons purports that sugar can be addicting and that this addiction is a measurable physiological state. According to Dr. DesMaisons, sugar acts like a drug, affecting the same receptors of the brain as heroin.3 There is some scientific evidence that supports the hypothesis that sugar affects the brain as a drug. For example, in one study, rats who binged on a diet of food and sugar water exhibited drug withdrawal symptoms – such as the shakes and teeth chattering – when the researchers stopped this diet (or administered an opioid blocker).4 

There is some debate among experts about using the word “addictions” for sugar in the same way as it is used for drugs, alcohol, and other substances. In spite of this controversy, it cannot be denied that many people use foods such as sugar to help them manage uncomfortable emotions, situations, and even thoughts. Some mental health professionals believe that this may be a form of “self-medication” – the use of self-soothing behaviors, such as the use of alcohol, caffeine, and even sugar – to cope with untreated mental distress. The problem with this type of behavior is that it deceives people into focusing on getting relief as opposed to obtaining true healing for their psychological distress.

The Mind-Body Connection
As we can see, there is adequate support that we can enhance or impair our mental functioning by that which we take into our bodies. As stated by a health authority, “The relation that exists between the mind and the body is very intimate. When one is affected, the other sympathizes.”5

For those suffering from any type of mental or emotional disorder, removing refined sugar from the diet can contribute to true psychological healing. Even if you are not suffering from such difficulties, the avoidance of excess sugar can be helpful for optimal mental and emotional functioning.




1) White, E.G. Counsel on Diet and Foods, p. 327

2) Peet, M. International variations in the outcome of schizophrenia and the prevalence of depression in relation to national dietary practices: an ecological analysis. British Journal of Psychiatry. May 2004, 184:404-408.

3) DeMaisons, K. (1998). Potatoes Not Prozac.  Simon and Schuster.

4) Avena, N.M., et al. Evidence for sugar addiction: behavioral and neurochemical effects of intermittent, excessive sugar intake. Neuroscience Biobehavioral Reviews . 2008; 32 (1): 20-39. Epub 2007 May 18.

5) White, E.G. Ministry of Healing, p. 241

6) Griffin, Vicki, et al. (2006) Living Free. Lifestyle Matters. www.lifestylematters.com 

Photo by Calebe Miranda

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