Safe weight loss is 1-2 lbs/week, so it's feasible to lose 10 lbs in a month. Whether it's healthy or not, depends on how you do it. If you simply calculate your daily caloric needs and cut your intake to that, eating healthy food and getting a reasonable amount of exercise, then it's healthy. If you're going to take drugs or weight loss supplements and try starving yourself, it won't be healthy.
i'm sure we all know that 10 pounds in a month is a hard task. that does not mean that it is un doable. if you eat 1,300-1,500 calories a day of fruit and veggies, and are doing cardio 5X a week along with strength training 4X a week you could probably reach your goal.. but overall the point is not to lose weight, the point is to live a happier healthier lifestyle where you are more confident with the way your body looks not what is on the scale
I like to measure my success as to how my clothes fit. And if I can fit into my skinny clothes. Also. I agree with the ladies above. Learning to be fit and eating right is a lifestyle change. You pick up good habits that you can live with. One for me is to eat fresh vegetables in my salad everyday. And skip the bad salad dressings. A little balsamic vinegar is tasty and easy to get used to. Then every once and awhile when you're at your goal weight you can splurge and have a little Cesar's dressing. But I always put it on the side.