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Why do boost DC DC converters have low efficiency at low load currents?

Not only BOOST type DC/DC converters, other types of DC/DC converters, such as BUCK type DC/DC converters, BUCK-BOOST type DC/DC converters, flyback and forward DC/DC converters, etc. Efficiency is lower at low load currents. Generally, below the 1/5 low load condition, as the output power of the DC/DC converter decreases, the proportion of the internal loss of the DC/DC converter in the total power increases, causing the efficiency of the DC/DC converter to decrease.