Discussion: Two identical twins are given the same calories but different compositions. Assuming they perform precisely the same tasks- Will they necessarily gain the same amount of calories?

The answer is "not necessarily."

Surprisingly, processed foods make us gain weight much faster than the same calories of natural foods. 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.

The explanation stems from the fact that food composition is essential. Tissue rehabilitation requirements are not necessarily the same, and their gut flora differs. 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 a 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.

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