Adding more fiber to a pet's diet can be of help with both overweight and regulation. Insulin resistance can come, at least in part, because a pet or person is too heavy. Fiber helps with weight loss because it allows one to feel "full" without the need to consume more food.
Those who have food spikes may find they can be eliminated or made manageable by putting more fiber in their diet,  as it slows glucose absorption. Putting the brakes on food spikes means coming closer to regulation. Overall because it helps reduce or eliminate some of these regulation difficulties, more fiber can mean less insulin .
At this time, it is believed that both soluble and insoluble fibers can benefit diabetic dogs. The present thought is that fiber's fermenting effects modify secretion of certain gastrointestinal metabolism hormones which have an influence on insulin sensitivity. 
Fiber can also be of help with some bowel disorders, absorbing moisture in the case of diarrhea, and adding it to aid with constipation.  It also finds use in weight reduction/weight maintenance diets. Use of a high-fiber diet can be helpful for dogs with anal gland problems. 
Proven to be effective in also controlling human diabetes, is the introduction of more soluble fiber into the diet.  Insulin-dependent diabetics especially benefit from dietary manipulations, which aid in insulin therapy. No one would suggest that someone with diabetes of either type should eat as he/she pleased and control things solely with insulin or oral medications.
Studies of people with diabetes indicate that a high-carbohydrate diet is associated with increased blood glucose fluctuations and hypertriglyceridemia. Those on a high-carbohydrate/low fiber diet containg soluble fiber had lower glycosylated hemoglobin values, lower post-prandial blood glucose levels with either a reduction or end to the hypertriglyceridemic effect.
Color coding of table entries:
- Applies to both soluble & insoluble fiber
- Applies to soluble fiber only
- Applies to insoluble fiber only
|Adds bulk to your diet,|
making you feel full faster
|May reduce appetite|
|Attracts water and turns to gel during digestion, trapping carbohydrates and slowing absorption of glucose ||Lowers variance in blood sugar levels |
Regulates blood sugar
|Speed the passage of foods through the digestive system||Facilitates regularity|
|Adds bulk to the stool||Alleviates constipation|
Canine studies  indicate that a higher-fiber diet improved all glycemic indices: significantly lower fructosamine results and reduction in post-prandial hyperglycemia, among them. Unlike their human counterparts, who, despite other significant improvements, were unable to lower their insulin requirements by the addition of soluble fiber, 9 of 11 dogs in a particular study lowered theirs with adding soluble fiber. Higher fiber diets  reduce insulin resistance. Choice of a diet which includes higher fiber is also effective in managing the post-meal blood glucose rise in dogs; managing this successfully means better overall blood glucose control. 
Drs. Fleeman and Rand produced a 2003 study of dogs whose diabetes was in control with feeding both high-fiber, moderate starch-containing food against commercial dog foods containing moderate amounts of fiber and low starch. They found there was no advantage to the high-fiber, moderate starch diet. 
Most pro-active canine caretakers home monitor their dog's blood glucose levels multiple times on a daily basis with regular curves and fructosamine testing. Many are feeding one of the various prescription diabetes diets in either dry or canned form. The most common protocol is feeding and giving Intermediate-acting insulin injections 12 hours apart. , with the most commonly used insulin being R-DNA/GE/GM NPH insulin. 
Barring unexpected things like urinary tract and other infections etc., most are well-regulated and under renal threshold at all times with no need for intensive therapy involving basal/bolus protocol. Just as no human with diabetes will repeat the same blood glucose readings day after day, the same is true for pets. The possible stresses and other factors which can influence diabetes are unable to be reproduced, and therefore, it is impossible.
Dogs whose diabetes is not well-controlled don't metabolize nutrients well; a symptom of this is polyuria. They will require more calories than a healthy/well-controlled dog as a result of the poor metabolism.
Diet needs to be nutritionally sound and palatable to the individual pet, to make food intake predictable.
Since the insulin regimen for most dogs is of a fixed pattern, having a predictable glycemic response should be achieved each time. This means that each meal should be comprised of roughly the same ingredients and caloric content and fed at the same times each day. Being consistent with food and insulin times makes for the best results. 
- ↑ Vetsulin-Page 13. Intervet.
- ↑ 2.0 2.1 Elliott, Denise A. (2006). Feeding the Diabetic Patient-Page 34. OSU Endocrinology Symposium.
- ↑ Managing Diabetes-Diet. Intervet.
- ↑ 4.0 4.1 Greco, Deborah (2010). Treating Diabetes Mellitus in Dogs and Cats. Western Veterinary Conference.
- ↑ Increasing Fiber Can Mean Reduced Insulin Needs. PetsHealth.
- ↑ Fiber in Pet Foods. Pet Education.com.
- ↑ High-Fiber Diet & Anal Gland Disease. Pet Education.com.
- ↑ 8.0 8.1 Fleeman, Linda, Rand, Jacqueline (2000). Long Term Management of the Diabetic Dog-page 4. School of Veterinary Science, The University of Queensland.
- ↑ Fiber. MedlinePlus Medical Encyclopedia.
- ↑ Fiber. University of Maryland Medical Center Encyclopedia.
- ↑ Nutrition for foodservice and culinary professionals.
- ↑ Canine Diabetes-Dietary Management. Web MD.
- ↑ Bruyette, David (2001). Diabetes Mellitus: Treatment Options. WSAVA.
- ↑ Managing Post-Prandial Rise Means Better Overall Glucose Control. Intervet.
- ↑ Fleeman, Linda Rand, Jacqueline, Markwell, Peter (2003). Diets With High Fiber and Moderate Starch Are Not Advantageous For Dogs With Stabilized Diabetes Compared to a Commercial Diet With Moderate Fiber and Low Starch. School of Veterinary Science, The University of Queensland, Australia.
- ↑ Elliott, Denise (2006). Feeding the Diabetic Patient-Page 33.
- ↑ Insulin Choices for Dogs. BD Diabetes.
- ↑ Nelson, Richard (2006). Selecting an Insulin for Treatment of Diabetes Mellitus in Dogs & Cats-page 39. OSU Endocrinology Symposium.
- ↑ Timing of Meals. Intervet.
- ↑ Diet & Exercise for Diabetic Dogs. BD Diabetes.
- Effect of Dietary Insoluble Fiber on Glycemia Control in Dogs With naturally-Occurring Diabetes Mellitus Nelson, Richard, et. al.,1998, Journal-American Veterinary Medical Association
- Fiber in Dog Foods Drs.Foster & Smith Pet Education Library
- Nutrition for Aging Cats and Dogs and the Importance of Body Condition Veterinary Clinics of North America Small Animal Practice 2005
- Feeding the Diabetic Patient-Page 33 Elliott, Denise, 2006, Ohio State University Endocrinology Symposium
- Dietary Fiber ProVet UK
- Vetsulin-Nutrition Intervet
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