Discussion: For example, two identical twins perform the same activities and eat the same calories but in a completely different composition. Will they see after a while the same changes in weight?

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 answer is "not necessarily." the explanation stems from the fact that food composition is essential. 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.

Since food routing between the two primary uses (tissue building and maintenance, as opposed to available energy and fat accumulation) is not fixed and differs from person to person, summarising the calories in food and beverages is inaccurate.

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