Beef vs. Plant-Based Burgers: Digestive Differences and Impact on Gut Microbiota

A recent study published in the Food Research International Journal examined the digestive process differences between beef-based (BB) and plant-based burgers (PB), focusing on the lipemic response and gut microbiome alterations.

Both ultra-processed PB and traditional BB have similar sensory characteristics, but there remains a gap in understanding how their distinct physical structures affect digestion. Comminuting muscle in BB leads to the presence of partially intact meat fibers and bundles, while a high shear process in PB forms a three-dimensional protein network.

Consumer interest in plant-based meat alternatives has grown due to concerns about greenhouse gas emissions, animal welfare, and resource-intensive food production. Plant-based analogs, such as patties, sausages, and nuggets, aim to mimic the sensory characteristics of meat.

The study utilized the TIM Gastrointestinal Model to analyze structural variations between BB and PB burgers throughout digestion. Researchers examined the moisture, protein, lipid, ash content, and free fatty acid composition of the burgers.

The TIM-1 model simulates digestion for BB and PB with a lipid fed-state protocol, accurately replicating human gastric and small intestinal conditions. Researchers used nuclear magnetic resonance to quantify branched-chain fatty acids (BCFAs) and short-chain fatty acids (SCFAs) during simulated digestion.

Results showed significant differences in moisture, protein, fat, ash, and carbohydrate composition between BB and PB burgers. BB contains higher protein and fat levels, while PB has higher carbohydrates due to added potato starch, methylcellulose, and maltodextrin, necessary for creating a meat-like texture.

After a seven-day treatment with PB or BB, notable differences were observed in the abundance of Firmicutes and Bacteroidetes in the ascending and transverse colon. Bacteroidetes were higher after BB consumption, while Firmicutes were higher after PB intake, leading to a higher Firmicutes to Bacteroidetes ratio (F/B ratio) after PB consumption for seven days.

The relationship between the F/B ratio and health status is unclear, with obesity potentially linked to various fecal microbiota profiles. The study identified 25 bacterial genera and 17 bacterial families in the Simulated Human Intestinal Microbial Ecosystem (SHIME) colon vessels, with four taxa characteristic of PB and seven associated with BB.

PB consumption led to a notable increase in the prevalence of Enterobacteriaceae, Clostridiaceae, and Planococcaceae sp. Lysinibacillus, which may pose a potential risk for gastrointestinal disorders with long-term intake of meat analogs.

The study concluded that plant- and animal-based meats have different digestive outcomes from ingestion to excretion, resulting in variations in gut microbial population and metabolites. These findings suggest that the nutritional content and nutrient efficiency of meat substitutes affect substrate usage and bacterial proliferation, leading to changes in metabolite production. Future advancements should focus on creating structures similar to whole foods while maintaining the sensory characteristics of real meat.

Check out these plant-based burgers you can make at home!

• Curry Chickpea Kale Burgers and Baked Sweet Potato Fries [Vegan]
• The Best Ever Veggie Burgers [Vegan]
• Moroccan Sweet Potato Burgers [Vegan]
• Black Bean Burgers [Vegan]
• Pumpkin Bean Burgers [Vegan]

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