Saturday, September 16, 2017

Evaluating Nutrional Research for Pets - Update by Meg Smart DVM, PhD

 Nutrition an Ancient Science is the Cornerstone of All Animal Research
The first organisms formed on earth survived if they could extract the necessary nutrients available from their environment for their survival. The science of nutrition is as old as life. Because of this association nutrition is found to impact on or influence many diverse disciplines. These complex relationships makes large scale nutrition research in both man and their companion animals difficult to control. On the other hand, small controlled studies are limited in their application to the general population.
Nutrition is the cornerstone for all scientific research done on live organisms. Any research involving live plants, insects, microbes or animals is first and foremost a nutritional experiment. Unfortunately this concept is not held by many in the scientific community who study the impact of their experimental design on the research animals they use... The diets for these animals are often not described or they are commercial diets formulated to meet the book requirements for the animals studied. And not necessarily the genetic groups the researchers are using. The argument is if the diets are the same for all control and  treatment groups then there is not a problem as they are investigating the impact that a certain pharmaceutical, vaccine, genetic mutation, or myriad other alterations have on a certain outcome. But what if the genetic mutations have different nutrient requirements than the original organism, could this impact negatively or positively on the outcome of the research result? We have determined through research what the basic nutrient requirements are for many species of plants and animals.  But these survived, grew and reproduced on foods long before nutrient requirements were known.

Figure 1 The Ancient Science of Nutrition- “Nutrition is essential to the evolution and adaptation of life” Meg Smart DVM PhD Professor Emeritus in Clinical Nutrition.
Nutrition The Ancient Science involves many disciplines
Nutrition as an Integrative  Cooperative Science Involves many disciplines
Modern View of Nutritional Science is  isolated creating conflicts
The  GI Microbiome (microbes)
Plant , Animal, Human and Animal Health (medicine) Soil, Environmental, Immunology, Microbiology, Organic and Inorganic Chemistry , Food, Anthropology, Evolutionary Development, Physiology, Pathology, Immunology, Neurology (Mental health), Gastroenterology, Pharmacology
Nutrition vs Pharmaceuticals

Rural vs Urban

Natural vs Synthetic

Organic vs Chemicals
Grass fed vs Grain à
Free range vs Factory farms

Whole foods vs Processed foods

Extract nutrients from foods

Produce vitamins

Convert dietary Phytonutrients into biologically active forms

Involved with essential fatty acid metabolism
Integrative Communications with, brain, immune, and endocrine systems
*** Susan L. Prescott and Alan C.  Logan 2017 “The Secret Life of Your Microbiome” New Society Publishers

Lesson2:Research Funding: An article “Science under Siege” although about pharmaceutical research (Discover Magazine Oct2007)) reflects on what is occurring in the pet food industry. Private funding to academic institutions by big pharmaceutical companies is allowing science to become a powerful tool in their fight against regulation. Research in small animal nutrition has been traditionally underfunded or more accurately seldom funded by independent granting agencies, unless the study involves animal models for human diseases. This has left the field wide open for the pet food industry to control and direct the research done in an academic institution, and within their own facilities. Research into pet foods is seldom at “arm’s length”.
 Understanding and Interpreting Research and Development (Food vs Companion Animal)
Research into the nutritional requirements of companion animals is not as straight forward as it is in livestock nutrition. In food animal trials, animals of the same age, breed and gender are assigned to established treatment groups, data collection dates are established, the end point of the trial is set (usually slaughter). The animals are kept in pens in a uniform environment, with diet being the only changing variable the data is collected, statistically compared, and conclusions are drawn from a relatively uniform group of animals.
 Although all animal trials must have prior approval by affiliated Animal Care Committees to ensure humane treatment, livestock trials often, end with the humane slaughter of the animals and tissues harvested for detailed analysis.
Lesson 3:Companion Animal Research  and Research Designs
In the past and to a limited degree now, normal dogs and cats were surgically altered or fed poisons directed at damaging a specific organ in order to evaluate the response of that animal to nutritional intervention. Although the results are still used to justify the formulation of some Veterinary Therapeutic Diets, do they actually represent the progression of a natural disease?
Companion animal experiments in the past may have ended with the euthanasia and necropsy of the animal, but to-day this type of conclusion is not acceptable in the public’s eye.
The validity of trials conducted on dogs and cats kept in a kennel or research facility is questioned, as these animals do not have the same freedoms and human bonding experiences of the pets kept within a home environment. Most nutritional trials on companion animals are only valid for that particular group, maintained under the same conditions, fed identical diets. Even the results from the relatively simple non-invasive digestibility, palatability and feeding trials done in kennels or catteries specifically established and approved to conduct these trials have come under scrutiny when environment, previous diet, gender, breed and age differences are considered
Lesson 4: Research methods
The design of the nutritional study determines how significant or relevant the tested diets are in caring for a pet with a specific health problem. The following research designs are listed in order of importance. (4). ( these have been modified from the original to be applicable to veterinary clinical nutrition\. These guidelines provide both the consumer and the veterinarian with a set of criteria to critically evaluate the research associated with veterinary medical foods and determine if the product is truly efficacious.

Figure 1

The evidence pyramid: Adapted for evaluating the research associated with the efficacy of veterinary medical diets
The following are the levels of research going from the most important to the least.
Level 1: Randomized controlled studies
A group of similar animals housed under the same conditions are fed diets, over the same time frame, one a control diet and the other(s) is(are) intentional modifications of that diet.
 In most trials, the animals are randomly assigned to control, treatment groups’ .Predetermined timed clinical examinations of the animal, and tests measure the clinical and metabolic response of the animals to these diets. The results are then analyses by what is considered to be the most appropriate statistical program, the results are interpreted and conclusions drawn. Many variations of these trials exist. To eliminate biases the most common are blind studies were the people who are feeding, collecting and analyzing the data are not aware of the status of the diets.  These studies ae considered the gold standard when it comes to evaluating nutrition, but in companion animal nutrition they fall short as the same results may not be seen in different breeds of dogs and in dogs housed under different environmental conditions.
Level 2: Prospective Studies
In a prospective study, pets with a specific problem that meet a specific set of clinical signs and metabolic changes are selected. These patients are divided into several groups and specific diet(s) are fed. Changes in their clinical and metabolic condition are monitored over a set period using predetermined clinical and analytical criteria established in the research protocol. A control diet or control group may be included. These are pets and are not kept for the trial period in a research facility but at home, so patient/owner compliance becomes an issue

 Level3: Retrospective Studies
Retrospective studies are common in companion animal nutrition; these studies utilize the owner’s recall of events and the medical records of a group that has a similar condition. The history and records are analyzed to determine if common threads are present within this information that can lead to problem identification, associated risk factors. Conclusions are then drawn and eventually solutions found.
Formally, these are epidemiology studies and are by far the cheapest to do.
Level4: Third person research
A knowledgeable individual or a group of specialists review, interpret and summarize pertinent published literature on a particular topic. Conclusions drawn and recommendations made. The findings are published in a Journal as a review article or books. The 2006 NRC nutrient requirements for dogs and cats and the AAFCO nutrient profiles for Dogs and Cats used by the industry to define and develop “complete and balanced” diets are examples of this type of research. “Cooperate biases” can strongly influence literature selection.
Most of the industries preliminary formulations and diets were done using this method. A successful diet or marketing strategy provides the financial resources for further product development.
Level 5: Case-control studies
For these studies, the histories of patients with a certain condition are compared to those without that problem. In veterinary medicine, the researcher is dependent on the owners to provide a reliable history for both the study and the control group. Once enough cases are collected and similar results found, the researcher may write a review article following a scientifically proven path, design a prospective, or a retrospective study to support the case findings. Randomized control studies are the next level up were the hypothesis are made from the previous studies and tested in a more controlled environment

Level 6: A series a case reports or a single case report
These are generally the first step in developing a research hypothesis they represent a case or a series of cases that are unique and respond to a particular diet. If these are not published as case reports, they are regarded as antidotal evidence and of limited value. These are considered the lowest level validation
L:evel :7 Educated ideas, editorials, opinions although not regarded as scientifically sound, initially most veterinary diets were developed and marketed based on these criteria.
In the beginning:
1) Hill’s Pet Food Company (
“A company inspired by a guard dog"
In 1939, Dr Mark L. Morris Sr. believed certain diseases in pets could be managed through carefully formulated nutrition
2) Iams Company (
In 1946, Paul Iams, an animal nutritionist, started the company in a small feed mill near
Dayton Ohio. His aim was to formulate a diet better than that available in grocery stores
3) Nestles Purina (
Founded in1893 by William H Danforth a pioneer in the commercial feed industry, His idea was that animals must eat year round. In1926, Purina developed diets for the hunting and working dogs of their rural clients. In 1950, he started to apply the knowledge of farm animal nutrition to the development of a highly nutritious and palatable dog food sold through grocery stores. In1957, Purina Dog Chow entered national distribution.
4) Mars Inc. (Master foods) (
“Every day a new idea”
One of the largest “small family businesses” in the world. Founded by Frank Mars in 1911, who with his wife Ethel started to sell butter cream candies from their home in Tacoma, Washington.
In 1930, Forrest Mars pioneered the development the European pet food industry combining modern manufacturing techniques with nutritional science.
Unfortunately the way that these multinational have set up their pet food branches, the consumer still thinks of them as a small family run business and not as part of a large multinational conglomerate.
Lesson5:Validation of Research
Within the scientific community, none of these research trials is considered valid unless published in a forum that requires peer review and approval prior to publication. This process relies on the integrity and policies of the Journal’s editorial board and the reviewers. To accomplish this can take considerable amounts of time.
“Cooperate biases” can weaken the validity of nutritional research by promoting studies with a positive effect and ignoring those showing a negative trend or by amalgamating several weak positive studies produce one strong positive result. Another concern is if the company‘s Research and Development division are interested in supporting a particular conclusion studies showing negative results may-be excluded. Positive trends rather than statistically sound results are cited as positive research in support of a diets formulation and efficacy. In order to properly evaluate companies research, the reader must be satisfied that “cooperate bias” did not exist in the formulation or in the marketing of a veterinary medical food. This may-be almost impossible to determine from the information provided by the company.
Confidentiality dictates what research supported by Pet Food Companies is published in peer-reviewed journals. They also bypass this step by holding or sponsoring conferences/symposiums and publishing fact sheets where non-peer reviewed research and the preliminary results of research studies are presented.
 Let us examine how long this process can take within an academic institution, when non-industry independent funding is available through grant competitions:
Step 1: Establishing the hypotheses to prove, designing the experiment, getting Animal Care approval, writing and applying for grants to fund the trial can take from 2 to 12 months.
Step 2: The wait for funding approval depends on the deadlines for grant submissions, but the wait can be between 2 to 4 months.
Step 3: Upon approval the trial must be set up this includes establishing the facilities, purchasing the animals, notifying the testing centers when their services are required, hiring graduate students and technical help to run the trials. If this can be expedited the time frame could be as short as a month or as long as four months.
Up to this point, between 5 to 20 months have passed, without a bite of food being eaten.
Step4: The length of actual trial including a period of adjustment depends on the hypotheses but will likely be between six to 36 months. The ideal period would be over the lifetime of the pet of 10 to 14 years. During this time as the data is being collected, the results received can be collated and preliminary analyses done.
Step5: All the data is collected, statistically analyzed, interpreted and put into a format suitable for publication. Depending on how well organized the principle researcher is and the availability of graduate students to do a literature search and writing, this process can take between 3 to12 months to complete.
Step 6: The actual peer review, manuscript corrections and publication of the research can take between 6 months to 18 months to complete or the research can be permanently stalled at this step. One of the major obstacles is when the reviewers submit diametrically opposed corrections and/or recommendations.
Under ideal conditions, this whole process from step one to six can take from 13 to 66 months to complete.
The Cooperate Sector
Within the cooperate sector how long this process takes is not as transparent. What we do know or are told is that Research and Development is a big budget item. What we are not told is what percentage of that is allocated to pure scientific research into the development and efficacy of their veterinary products and what is allocated to the research and development into factors that improve product profitability, such as new marketing strategies, new packaging, improved manufacturing methods, flavour development etc. One company has a whole department, headed by an engineer with a PhD, devoted to research into new packaging that is acceptable and convenient for the consumer, maintains the shelf life of the food under the most adverse of conditions and is practical to handle and economical to ship.
All of the companies maintain state of the art companion animal facilities were non-invasive studies related to diet palatability and digestibility are done. In some, dogs are trained to assist people with special needs. Each facility is a showcase and a window through which the public is allowed look and judge the company. The motives and power that drives the multinational co-operations, and the marketing strategies used to sell their products are not evident.

The Human Factor
Unfortunately, every step involved in the interpretation, accessing the relevance and evaluating the quality of research has a major obstacle “the human mind” with all its frailties. One should never accept as truth research results without critically evaluating the final published article for its strength and weaknesses

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