My son is 14 and weighs 177. he is 5'8". is this healthy weight or should he lose some?

At risk weight: His BMI (body mass index) is close to 27 - it's greater than the 95th percentile. {healthy is considered 25%-85%, at-risk is 85%-95% and obese > 95%}. You know his habits better than anybody but basic recommendations consist of: Eliminate sweetened drinks (juices, sodas) and 24-32oz of water per day recommended. Low fats, lean proteins, limit simple carbs. Minimum exercise is 30min 3x per week.

YES: Your son is 14 yeas old 5-8 height is 75th centile 170 lbs will be above 95th centile for weight which is high according to this height, his weight should be no more than 150 lbs He needs to lose some weight. Obesity is one of the big long-term risk to his health and ;longevity