What is a common health concern associated with an improper diet in horses?

Obesity is indeed a significant health concern associated with an improper diet in horses. Horses that receive excessive calories, particularly from grains and rich feeds, without adequate exercise may become overweight. This excess weight can lead to multiple health problems such as laminitis, metabolic syndrome, and increased risk of colic.

Maintaining an appropriate balance of nutrients is essential for a horse's overall health. A proper diet should support the horse's body condition score, energy needs, and activity levels. In contrast, options such as having high energy levels, improved coat quality, or increased muscle mass are generally considered positive outcomes of a suitable diet and training program. A high-energy level could actually be a concern if it leads to restlessness or behavioral issues, but it is not typically viewed as a health concern in the same way that obesity is. Improved coat quality and increased muscle mass often result from a balanced diet, exercise, and overall care, rather than being health concerns.