A ripe lime is bright green and for maximum freshness are best stored in a fridge. Once they turn yellow, they are overdue. When using limes allow them to sit at room temperature for optimal taste. If stored somewhere with too much humidity, mould will begin to form on the lime, brown spots on the lime indicate dehydration and too much exposure to light causes them to yellow. Limes, just like lemons are great to juice and use to prevent a fruit salad from browning.
A 100g portion typically contains 11g carbohydrate, 0.2g fat, 0.7g protein and all for just 30 calories!!