Why are pandas so 'chonky' despite their vegan diet?

A new study found that pandas remain chubby despite their “poor-quality diet” because of the relationship between gut bacteria and the metabolism.
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Nobody would use the adjectives “lean” or “athletic” to describe China’s roly-poly giant pandas, even though they eat almost entirely bamboo for their entire lives.

Why are pandas so 'chonky' despite their vegan diet?

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Explainers: Science South China Morning Post