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Have you tried to help your horse lose weight and, despite your best efforts, succeeded only in frustrating you both? I routinely get calls from equine guardians who, despite implementing a “diet” and slow feeders, report that their horses are bored and miserable, standing around with nothing to eat – or eating dirt, manure, shavings – or even destroying objects. These folks tried to do everything “right,” yet they did not achieve positive results. Why? Because their strategy to achieve weight loss did not take several important factors into account. Read on to learn why you should say no to crash diets, what a healthy gradual weight loss protocol is, why it's crucial to keep periods of fasting to a minimum - and to see what helped the horse below reduce her weight and insulin resistance in four months.  Say No to Crash Diets A Far Too Common Scenario Equine guardians instructed by a trusted source to put their horse on a “diet” by limiting their forage intake to 1% of their current body weight with no regard to extended periods of fasting, the type of forage being fed or whether nutritional needs are being met. Result: loss of muscle, fat deposits remain the same or worsen, the horse is miserable, and they feel guilty and at a loss. While it may seem counter intuitive, drastically reducing calories (an equine crash diet) can quickly backfire - resulting in a sluggish metabolism, insulin spikes, muscle loss and storage of fat to compensate. Equines require a minimum number of healthy calories and nutrient levels (water, fats, carbohydrates, protein, vitamins and minerals) to maintain as much muscle as possible and lose weight/fat while striving to achieve optimum thyroid/hormone function. No equine is immune to being malnourished, including overweight individuals.  3 Rules of Healthy Gradual Weight Loss 1. Feed A Healthy Balanced Diet & Provide Adequate Nutrients The recommended core diet for weight loss should include:
 2. Ensure Your Horse Is Getting Enough Forage The absolute minimum amount of grass hay to feed for weight loss is 1.5% of your horse's current body weight or 2% of ideal weight, whichever is more. Note: Flakes of hay are not appropriate to use as a measurement. A flake of hay can vary drastically in dimensions (size of bale), thickness and density. If you are feeding meals, these two steps will help to keep periods of fasting to a minimum (more about the importance of this topic to follow):
 Why is it important to keep periods of fasting to a minimum? Because fasting for more than a few hours worsens Insulin Resistance/Dysregulation in horses. According to the equine study The Effect of Fasting Duration on Baseline Blood Glucose Concentration, Blood Insulin Concentration, Glucose/Insulin Ratio, Oral Sugar Test, and Insulin Response Test Results (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5032872/) : “Starvation and very low-calorie diets have been shown to cause insulin resistance and diabetes in rodents and humans. These data suggest that withholding feed for more than a few hours will decrease insulin sensitivity, and may be counterproductive to the treatment goals in EMS [Equine Metabolic Syndrome] In summary, the longer a horse was fasted, the more likely it was to be classified as insulin‐resistant when performing the IRT (insulin response test).” Insulin Resistance/Dysregulation Defined – How Fasting Induces/Worsens IR Dr. Juliet Getty graciously expanded on the topic: “Insulin Resistance/Dysregulation is when an individual experiences significant increases in insulin levels in the bloodstream because they are unable to “open the cells gates” to deliver glucose to the body’s cells to burn as fuel. In other words, the cells become "resistant" to insulin, or less sensitive, resulting in higher levels of glucose in the blood. The pancreas senses this elevated level of glucose (hyperglycemia) and responds by secreting even more insulin. This impaired insulin metabolism is referred to as insulin dysregulation. A healthy horse will have cells that are sensitive to insulin. It has been shown that allowing horses to be fed on a regular basis will improve insulin sensitivity. Conversely, withholding feed and/or forage for more than a few hours, will induce insulin resistance, leading to elevated blood insulin levels (hyperinsulinemia). As insulin rises, it tells the fat cells in the body to hold onto the fat. Therefore, restricting forage, for example, can have the opposite intended effect; it can cause the horse to lose muscle and become more obese.”  Insulin sensitivity fluctuates throughout the day and night depending on numerous factors, including fasting. An equine with extended periods of fasting and/or underfed and/or malnourished can:
3. Avoid Periods of Fasting Without Weight Gain – Add Bulk & Chew Time This concept is what confounds so many that follow the above feeding protocol, yet weight loss isn’t happening. Most have implemented slow feeders, but find it impossible to avoid prolonged periods of fasting. In addition, they are either feeding untested hay or tested low sugar/starch hay – and unaware that the hay is 1) highly palatable and 2) higher in digestible energy and lower in fiber than it should be to confidently feed more than 1.5%-2% of their body weight a day. What to do? Avoid periods of fasting by feeding a low NSC forage that is higher in fiber and lower in digestible energy. Offer this as a slow fed free choice forage option. This could be in the form of a very mature grass hay or straw to:
Straw tends to be a controversial form of forage to many, but is commonly fed in conjunction with limited amounts of grass hay to manage weight in other parts of the world. Here’s some additional reading about straw, based on scientific evidence: 2 Important Tips
Is it Possible to Achieve Weight Loss & Provide Slow Fed, Free Choice Forage?Yes! Reba's story is a great example: Reba was surrendered to Desert Sky Ranch & Sanctuary suffering with laminitis and diagnosed with Insulin Dysregulation. Before her arrival, she lived alone in a stall with a small dry lot turn out and was fed meals consisting of Bermuda grass hay, Alfalfa and supplemented with a commercial feed. Reba experienced remarkable improvements just 4 months after arriving at the rescue, who provided her with a healthy, gradual weight loss protocol that consisted of:
 Photo on left, when Reba arrived at the sanctuary. Photo on the right, 4 months later. In Closing Testing your hay or straw is optimum to ensure nutrients and digestible energy requirements are being met, fed in conjunction with a ration balancer, salt and ground flaxseed. Healthy weight loss takes time, be patient. Prolonged periods of fasting and starvation/crash diets are not the solution. They compromise your companion’s mental and physical health and well-being. You can also read about my slow fed free choice journey: Are You a Prisoner of Feeding? Here's How I Broke Free. Special thanks to: Dr. Getty for taking the time to contribute to this article and answering my questions throughout the years. Desert Sky Ranch & Sanctuary for your selfless efforts to rescue and rehabilitate Reba and all the other residents with kindness, knowledge and compassion. Helpful Resources
Stay ConnectedWant to Hear About $ales, Nutrition Tips & Giveaways?Be the first to know by subscribing to our monthly newsletter. About the Author:
Monique Warren invented the Hay Pillow® slow feeder and is the owner of Hay Pillow Inc. Warren has been an equine guardian for over forty years and slow-feed advocate for over 10 years. She contributes equine nutrition and digestive and hoof health articles to publications such as Equine Wellness, The Journal, The Naturally Healthy Horse, Natural Horse Magazine, Nicker News, Horse Back Magazine, The Horse's Hoof, and Miniature Horse World Magazine. Equine nutrition and horses feet are her passions. She resides in Southern California. References
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