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Healthy Bananas is a premium upgrade for the Banana Farm in Bloons Tower Defense 4 and Bloons Tower Defense 5. It costs 15 in BTD4, 15 in BTD5, 4800 in Bloons Tower Defense 5 Deluxe, 1000 in Bloons Tower Defense 5 Steam and $0.69 in BTD5 Mobile. When you beat a level, you get as many lives as upgrades on the Banana Farms plus one for the Farm itself (Multiple farms also means more lives).
This Premium Upgrade allows for the only way to let an MOAB-Class Bloon through a level and still have lives to spare besides More Lives. If the player can save up enough lives, there will still be some left over if an MOAB-Class Bloon is let through. However, you'd need to save up 16,657 lives to let a ZOMG escape with 1 life remaining.