Many man-eating lions are single animals and very often in good health. Some reported cases are:

Lion / Pride Number of confirmed Human kills Country
Tsavo 28 Kenya
Namvelieza (The cunning one) 43 ?
Chambisi male 67 Zambia
Chienge Charlie 90 Zambia
Golis Mountains male 100 Somalia
Mporokse Pride 1000 victims in 10 years ?
Njombe Pride 2000 victims in 25 years Tanzania

The Tsavo kills are attributed to a coalition of 2 young males known as the Ghost & The Darkness

“In 1932, another famous series of attacks commenced in Tanzania near the southern town of Njombe. It took until 1947 to kill the final 15 lions from the pride and by this time over 1,000 people had been killed, with some being eaten. The lions of Njombe were a particularly interesting case as there seemed no obvious reason why they should start attacking man; their normal prey was in abundance and the cats were healthy.

Man-eating leopards are rare, but generally are males in their prime. Interestingly their individual 'scores' seem to be higher than those of lions, perhaps because of their relative size and they are more secretive by nature.