Which factor does not increase the risk of heat injury?

A well-hydrated individual typically has a lower risk of heat injury. Proper hydration maintains the body's ability to regulate temperature through sweating and circulation. When someone is well-hydrated, their body can manage heat stress more effectively, reducing the likelihood of heat-related illnesses.

On the other hand, recent consumption of alcohol can impair the body's ability to regulate temperature and can lead to dehydration, thus increasing the risk of heat injury. Being over 40 years of age is associated with a higher risk due to potential decreased physiological resilience to heat. Lack of experience or acclimatization also heightens the risk, as those who are not accustomed to heat stress may struggle to cope with high temperatures. Therefore, being well-hydrated is a protective factor against heat injury.