A diet based solely on meat can have certain health effects, some of which can be problematic. It’s important to be aware of these aspects:

1. Nutritional Deficiencies: A strictly carnivorous diet may lead to deficiencies in fiber, vitamins, and essential minerals traditionally obtained from plant-based foods.

2. Lack of Fiber: Meat lacks fiber, and insufficient fiber intake can affect digestive health and contribute to constipation.

3. Digestive Issues: Excessive meat consumption can cause digestive discomfort, such as indigestion or acidity problems.

4. Cardiovascular Risks: A diet rich in meat, especially processed or high in saturated fats, may increase the risk of cardiovascular diseases.

5. Impact on the Renal System: Excessive protein intake, especially from meat, can put additional strain on the kidneys.

6. Weight Maintenance Challenges: A meat-only diet can be challenging to sustain in the long term and may lead to difficulties in maintaining a healthy body weight.

A balanced diet that includes a variety of foods can bring long-term health benefits.

Human evolution has played a significant role in developing the capacity for humans to consume and digest both meat and vegetables. Several aspects highlight the evolutionary adaptations that have contributed to this capability:

1. Human Dentition: Human teeth reflect an evolutionary compromise between adaptation to both meat and plant consumption. We have both molars, efficient in grinding plant foods, and canines, which can contribute to meat consumption.

2. Digestive Tract: The human digestive tract has evolved to digest both meat, requiring proteolytic enzymes for protein breakdown, and plant foods, requiring enzymes for carbohydrate breakdown.

3. Cooking Capability: The use of fire and cooking has been a key innovation in human evolution. This allowed the efficient processing and consumption of both meat and vegetables, enhancing the availability of nutrients.

4. Dietary Knowledge: Human communities have gained dietary knowledge over time, learning to combine food resources, including vegetables and meat, to achieve a balanced diet.

5. Adaptability to Diverse Environments: Human adaptability to diverse environments has favored a diverse diet, including both animal and plant protein sources.

In conclusion, human evolution has endowed humans with a digestive system and adaptability that make them capable of consuming both meat and vegetables, reflecting a diverse and adaptable diet suited to different environmental conditions and available food resources.