Dogs and cats both strongly prefer food containing microbial protein over traditional protein sources, according to a 2026 study of 60 pets. Dogs consumed 72% of the microbial protein food compared to 50% of control food, while cats ate 51% versus 34%. Gram Research analysis shows this preference occurred even when both foods had identical nutrients, suggesting microbial protein could be a viable and tasty alternative to conventional pet proteins, though long-term health effects remain unstudied.
Scientists tested whether dogs and cats would actually eat food made with microbial protein, a new ingredient created from tiny organisms instead of traditional animal sources. In a study with 30 dogs and 30 cats, researchers compared two similar foods that differed only in their protein source. Both dogs and cats strongly preferred the food containing microbial protein, eating significantly more of it during taste tests. According to Gram Research analysis, this suggests microbial protein could be a promising alternative to conventional pet proteins while still being tasty to our furry friends.
Key Statistics
A 2026 study of 30 dogs found that animals consumed 72% of food containing microbial protein compared to 50% of traditional protein food, a statistically significant preference (p = 0.002).
In the same 2026 research with 30 cats, animals ate 51% of microbial protein-containing food versus 34% of control food (p = 0.001), indicating strong palatability of the novel ingredient.
Laboratory analysis of the microbial protein food revealed higher tryptophan content and a lower omega-6 to omega-3 fatty acid ratio compared to control diets, potentially supporting the observed preference in both dogs and cats.
The Quick Take
- What they studied: Whether dogs and cats would prefer and eat food containing microbial protein, a new ingredient made from microorganisms, compared to traditional pet food.
- Who participated: 30 dogs and 30 cats of various breeds and ages, tested in their own homes over four separate meals to observe natural eating behavior.
- Key finding: Dogs ate 72% of the microbial protein food versus 50% of regular food, and cats ate 51% of the microbial protein food versus 34% of regular food. Both preferences were statistically significant, meaning they were unlikely to happen by chance.
- What it means for you: If you have a picky eater, microbial protein-based pet foods might be worth trying. However, this study only tested short-term preference, so long-term effects and health benefits remain unknown. Talk to your veterinarian before making major diet changes.
The Research Details
Researchers conducted a preference test in the homes of pet owners to see how dogs and cats would naturally choose between two foods. Each pet was offered two bowls side by side, one containing food with microbial protein and one with traditional protein, but both foods were matched to have the same amounts of nutrients. The pets were tested four times, and researchers tracked which food they ate first, how much they ate from each bowl, and how often they approached each bowl.
To understand why the pets preferred one food over the other, scientists sent samples of both foods to an independent laboratory for detailed analysis. The lab tested the foods for basic nutrients, amino acids (the building blocks of protein), fatty acids, minerals, and compounds that create flavor or smell. This helped explain whether the preference was due to nutritional differences or other factors like taste and aroma.
The study was designed to be realistic by testing pets in their own homes rather than in a laboratory setting. This approach captures how pets actually eat when they are comfortable and relaxed, rather than in an artificial environment.
Pet food companies need to know that new ingredients are not only nutritious but also appealing to pets. If pets refuse to eat food made with new ingredients, those ingredients cannot be used in commercial pet food, no matter how healthy they are. This study bridges the gap between laboratory nutrition science and real-world feeding by testing actual pet preferences.
The study used a rigorous statistical test (Wilcoxon signed-rank test) to confirm that the preference for microbial protein food was real and not due to random chance. The researchers tested both species separately, which is important because dogs and cats have different taste preferences. Independent laboratory analysis of the foods strengthens the findings by confirming that nutritional differences did not explain the preference. However, the study was limited to short-term preference over just four meals, so it does not tell us whether pets would continue to prefer this food over weeks or months.
What the Results Show
Dogs showed a strong preference for the microbial protein food, consuming 72% of it compared to only 50% of the control food. This difference was statistically significant (p = 0.002), meaning there is less than a 1% chance this result happened randomly. Cats also preferred the microbial protein food, eating 51% of it versus 34% of the control food (p = 0.001), which is an even stronger statistical result.
Behavioral observations supported these consumption numbers. Both dogs and cats approached the microbial protein bowl more frequently and ate from it first more often than they approached the control bowl. This suggests the preference was genuine and not just a random choice.
The laboratory analysis revealed that both foods had similar amounts of protein, fat, and other major nutrients, so the preference was not driven by nutritional imbalance. However, the microbial protein food contained higher levels of tryptophan, an amino acid that influences mood and appetite, and had a better ratio of omega-6 to omega-3 fatty acids, which are important for skin and coat health. Neither food showed signs of off-flavors or unpleasant smells that might have affected preference.
The microbial protein food had a more balanced fatty acid profile, with a lower ratio of omega-6 to omega-3 fatty acids. This is noteworthy because excessive omega-6 relative to omega-3 can promote inflammation in pets. The higher tryptophan content in the microbial protein food may have contributed to its palatability, as tryptophan can influence appetite and mood. The fact that both dogs and cats showed preference suggests that microbial protein has broad appeal across different pet species, which is valuable for pet food manufacturers.
This is one of the first studies to directly test whether pets will eat food made with microbial protein. Previous research has focused on whether microbial protein is nutritionally adequate for pets, but few studies have examined whether pets actually like it. The strong preference observed here is encouraging and suggests that microbial protein could successfully replace traditional animal proteins in pet food formulations without sacrificing palatability.
The study only tested short-term preference over four meals, so we do not know if pets would continue to prefer microbial protein food if fed it regularly for weeks or months. The sample size of 30 dogs and 30 cats is relatively small, and the study did not report the breeds, ages, or health status of individual animals, which could affect results. The study was conducted only in home settings, so results may not apply to all feeding situations. The researchers did not test whether the preference would hold if the microbial protein content was higher than 10% or if the food was in different forms like wet or raw diets. Finally, this study measured only short-term preference and does not provide evidence about long-term health effects, nutrient absorption, or digestive tolerance.
The Bottom Line
Based on this research, microbial protein appears to be a palatable ingredient for both dogs and cats. If you are interested in trying a pet food containing microbial protein, this study suggests your pet is likely to eat it willingly. However, confidence in long-term benefits is low because this study only measured short-term preference. Consult your veterinarian before switching your pet’s diet, especially if your pet has existing health conditions or digestive sensitivities.
Pet food manufacturers should care about this research because it shows microbial protein is a viable ingredient that pets will eat. Pet owners with picky eaters might find this information useful when selecting new foods. Veterinarians may find this helpful when counseling clients about alternative protein sources. Environmental advocates should care because microbial protein requires fewer resources to produce than traditional animal proteins. People with concerns about animal welfare or sustainability may be interested in this alternative protein source.
This study measured preference during four meals, so the preference effect was observed within days. However, we do not know how long this preference would last if a pet ate microbial protein food exclusively. Long-term studies would be needed to determine whether pets continue to prefer this food over weeks or months, and whether any health benefits or problems emerge with extended use.
Frequently Asked Questions
Do dogs and cats actually like food made with microbial protein?
Yes, according to a 2026 preference study, both dogs and cats significantly preferred food containing microbial protein. Dogs ate 72% of the microbial protein food versus 50% of traditional food, and cats ate 51% versus 34%, suggesting strong palatability.
Is microbial protein as nutritious as regular pet protein?
This study confirmed that microbial protein food had comparable macronutrient composition to traditional protein food. The microbial protein diet showed a complete amino acid profile, higher tryptophan, and a better omega-6 to omega-3 ratio, though long-term health effects were not evaluated.
Can I switch my picky eater to microbial protein food?
This research suggests microbial protein food is palatable to most pets, so it may appeal to picky eaters. However, this study only measured short-term preference over four meals. Consult your veterinarian before making diet changes, and introduce new food gradually over 7 to 10 days.
What is microbial protein and why use it in pet food?
Microbial protein is protein produced from microorganisms rather than traditional animal sources. It requires fewer resources to produce, making it more sustainable. This study shows pets find it palatable, making it a viable alternative ingredient for pet food formulations.
How long will my pet continue to prefer microbial protein food?
This study only measured preference over four meals, so long-term acceptance is unknown. Future research is needed to determine whether pets would continue preferring this food over weeks or months of regular feeding.
Want to Apply This Research?
- If you switch your pet to a microbial protein-based food, track daily food consumption percentage and note any changes in appetite, energy level, coat quality, or digestive health over 4 to 8 weeks.
- Start by offering your pet a small amount of microbial protein food mixed with their current food, gradually increasing the proportion over 7 to 10 days. Monitor their eating behavior and enthusiasm for each meal using your app’s food diary feature.
- Log weekly observations about your pet’s appetite, body weight, stool quality, and overall energy levels. Set reminders to photograph your pet’s coat condition monthly to track any changes in skin or fur health. Compare these metrics before and after the diet change to identify any patterns.
This study measured only short-term food preference in a small sample of pets and does not provide evidence of long-term acceptance, health effects, or nutritional adequacy over extended periods. Before switching your pet’s diet, especially if your pet has existing health conditions, digestive sensitivities, or allergies, consult with your veterinarian. Individual pets may respond differently to new foods. This research is exploratory and should not be interpreted as a recommendation to replace your pet’s current diet without professional veterinary guidance.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.