Nope. If humans eat both carbs and fat (most of us do), the excess calories of fat goes mainly into the storage (or plaques to your arteries), while the carbs are used in the sort term (converted into glucose).
> Lipogenesis is mostly derived from carbohydrates and is a relatively minor contributor to whole-body lipid stores, contributing 1–3% of the total fat balance in humans consuming a typical diet.
The human body doesn't need to store excess calories. It could store the excess calories or it can excrete energy through urine(glucose, ketones)
Or it can ramp up metabolism, there are many scenarios. Not all lead to adipose tissue growth. Why not muscle growth, which is somehow always overlooked in these discussions.
Funny enough adipose tissue and muscle growth are both through hormones. If testorone and hgh are high then muscles growth will prioritised over adipose tissue.
People with type 1 diabetes have figured out how to stay thin after eating copious amounts[0]. They won't inject themselves with insulin. Unhealthy, sure, but they won't store calories, as adipose tissue (fat cells) remain inactive, even though blood glucose is dangerously high.
Just looking at calories is simplification, and is just for general guidance.
> Lipogenesis is mostly derived from carbohydrates and is a relatively minor contributor to whole-body lipid stores, contributing 1–3% of the total fat balance in humans consuming a typical diet.
From:
https://www.sciencedirect.com/topics/agricultural-and-biolog...
Believe what you will. "It is said" wrt sumo fighters does not sound very scientific.