Final answer:
The question asks about the amount of plant energy needed to reach 20 years old given a more plant-based diet. While we don't have enough specific information to provide an accurate calculation, we explain that different diets have different energy demands.
Step-by-step explanation:
The question assumes that you were raised on plants instead of meat and states that plant material has about 40% of the per-kg food value as meat. To calculate the amount of plant energy needed to get to 20 years old, we need more specific information. However, we can provide some general information about energy requirements and diets.
The typical American diet requires about six times the energy compared to a strictly plant-based (vegan) diet. If a vegan diet is down to 4 kWh/day, a vegetarian diet partaking of dairy and eggs (lacto-ovo diet) is a little less than 40% of the American diet (about 9 kWh/day). These examples help demonstrate that different diets have different energy demands.
To accurately calculate the amount of plant energy needed to get to 20 years old, we would need more information about your specific energy requirements, activity levels, and the energy content of the plant-based foods you consume.