The phrase "enough calories" means consuming an adequate amount of energy from food to keep your body healthy and functioning properly. Full definition
The reason I say that, is because it is very important that you eat enough calories in the evening after your workout. (bettermanproject.com)
P.S. Finding it hard to consume enough calories for my active lifestyle. (nutritionfacts.org)
When you eat a diet based on fruit, vegetables, whole grains, and legumes and are eating enough calories for your body, it's nearly impossible to be protein deficient. (educating-earthlings.com)