It's about lime

Believe it or not, there was a time when people actually liked lemons. In fact, until the end of the 19th century, the lemon business was a thriving industry. But in 1893 a small group of lime farmers, bitter from lackluster sales, decided to take down Big Lemon. Unable to afford expensive advertising campaigns, the group, known as the North American Lime Council, instead opted for a social engineering approach. It was this group who first coined the phrase "If life gives you lemons, make lemonade", and who first used the word "lemon" to describe defective products. By spreading these infectious catchphrases, the NALC hoped to wound the lemon's image. It worked: by 1897, the campaign had brought the lemon industry to its knees.
The lime farmers may have won, but as is so often the case, it's really the people who lose here. Limes are more expensive than lemons, and they contain only one third of the nutrients!