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Kids, teens, and adults are usually bombarded with media messages about weight loss at the beginning of the new year. Many young athletes face a double helping of this pressure because weight loss and/or fat loss is often touted as a path to improved athletic performance. While this article provides advice on how to talk with a young athlete who expresses a desire to lose weight, it’s also important for parents and coaches to learn about some of the supplements kids may be tempted to use.

Ingredients to Watch Out For

To be clear, there are no known dietary ingredients or supplement that measurably or consistently alter body composition or metabolism to result in loss of fat, or a change from fat to muscle. But there are several dietary ingredients that are often advertised to promote weight loss. In a 2006 study, it was revealed that 11% of US adolescents aged 14-19 have used weight loss supplements[1]. However, weight loss products are fraught with false promises and health risks that should be evaluated seriously by parents and discussed with kids. Below is a table from a study published in 2003 [2] listing ingredients that are commonly advertised in weight loss products. Ingredients commonly found in weight loss products Actions (or advertised actions) Ephedrine or pseudoephedrine (from ephedra [ma huang] or country mallow [Sida cordifolia]), caffeine, theophylline, theobromine (from cola nut, guarana, or mate), bitter orange (citrus aurauntium) Bladderwack (fucus vesiculosus), 7-keto-DHEA Stimulants. Can interact with medications, caffeine in other foods and drinks, and come with all of the side effects of stimulants (restlessness, insomnia, racing heart, etc.) Chromium picolinate, conjugated linoleic acid, carnitine, green tea, gymnem sylvestrea beta-hydroxymethybutryate, pyruvate, hydroxycitric acid (garcinia cambrogia), brindleberry Often advertise to modify metabolism but with little to no proof Ginkgo biloba, St John’s wort, Yohimbe Often advertised to decrease stress- or depression-related eating, again with little to no proof Soluble fibres (eg, glucomannan, psyllium, methylcellulose, pectin) Advertised to make you feel full Chitosan Advertised to block the absorption of fat Buckthorn bark and berry, Cascara sagrada bark,, flaxseed, manna, psyllium seed husk, rhuubard root, senna leaf and pod Laxatives. Do not actually make you lose weight. Can cause side effects associated with laxative use (diarrhea, abdominal discomfort, bloating).

Focus on “Fat Burners”

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Supplements marketed as “fat burners” are typically packed with stimulants, including (but not limited to) caffeine and the rest of the ingredients listed in the top row of the table above. While some of the ingredients in supplements marketed as fat burners may slightly increase lipolysis (the breakdown of fat), the primary effects of these supplements – and the primary dangers – are related to the stimulants.

1. Inadequate nutrition

Stimulants can temporarily enhance mental focus and the feeling of being “energized,” and thereby suppress appetite. This is the main way weight loss supplements promote caloric restriction, which then leads to weight loss. Significant caloric restriction can be particularly troublesome for kids and young athletes because it reduces intake of nutrients necessary to support growth, activity, and recovery. In addition to energy, kids get most of their vitamins and minerals from food. Weight loss supplements disrupt normal nutrient intake, which can leave kids low on calcium, iron, fat-soluble vitamins, and other important nutrients.

2. Jitteriness/Nausea/Trouble Sleeping

Adults commonly use stimulants – mostly caffeine – to increase alertness and mental focus. They consume coffee in the morning to “wake up” and caffeinated drinks later in the day to “stay awake.” Kids and young athletes have far less experience with stimulants and are not habituated to the amounts of caffeine adults commonly consume. To up the ante, weight loss supplements often contain considerably higher amounts of caffeine and other stimulants compared to a cup of coffee or a caffeinated soda. When exposed to large doses of stimulants with little or no tolerance already built up, kids and young athletes are more likely to experience adverse reactions. They may feel jittery or lightheaded, experience a racing heart rate, sweat profusely, and feel nauseated. These effects may last longer than they anticipate, leading to insomnia. Over-exposure to stimulants can even lead to heart arrhythmias.

3. Dehydration

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Adults who commonly consume caffeine adapt to its mild diuretic effect. Kids and young athletes who are not habituated to caffeine are more likely to become dehydrated after consuming stimulants. This risk is exacerbated by loss of appetite and/or nausea, because a significant portion of a person’s daily fluid intake comes from food.

4. Inability to Focus (over-use of stimulants)

The stimulants in weight loss supplements may increase alertness and improve focus for a little while, but these effects diminish with continual use. Mental and physical rest are essential for refreshing a person’s ability to focus, which is particularly important for success in school and sport. Stimulants cannot overcome fatigue, and young people who use stimulant-heavy weight loss supplements quickly find it difficult to focus, study, or stay on task.

5. Short Cut Mentality

Perhaps even more important than the acute negative effects, weight loss supplements encourage the idea that short cuts are acceptable in place of hard work. Throughout life, healthy weight management is best achieved through healthy food choices, eating to support an active lifestyle, and exercising for both health and performance. Improving sport performance, getting good grades, and earning the respect of your peers all take time and hard work, and weight loss supplements – like other forms of short cuts – devalue the commitment and work ethic parents and coaches try to encourage in young people.

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2654846/

[2] https://www.ncbi.nlm.nih.gov/pubmed/16215034

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