Discussion: For example, two identical twins (same weight, height, age, and sex) who eat the same calories but with different compositions. Will they gain the same amount of calories if their activity is identical?

The answer is "not necessarily." The explanation stems from the fact that food composition is essential. Their tissue rehabilitation requirements are not necessarily the same, and their gut flora is not the same. Different absorption of nutrients resulting from diverse intestinal gut flora and other needs for tissue regeneration may lead to different routes of nutrients for non-caloric needs. These discoveries are reflected in an existing technology called the "fecal transplant," which contradicts the common thought that all calories are equal. Calories in the lab are not the same as calories within the human body.

Surprisingly, processed foods make us gain weight much faster than natural foods, which contain the same calories. The nutrients we eat and drink and the calories they carry cannot vanish, but they can be redirected to other non-energy, "non-countable" purposes.

Link: Calories cannot disappear but can be redirected as uncounted.
https://www.sf-healing.com/page/141 (Copy & Paste)