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No. Laxatives are not an easy weight loss supplement - in fact, expelling waste from your body faster means a more rapid intake of calories and junk that you don't require.
Antibiotics
I don't believe anyone has a metabolism that variable. If someone exercises more or less, he'll require greater or fewer calories.
That depends on how many calories the person in question's body requires to stay alive, or their BMR (basal metabolic rate) which depends on age, sex and weight. If they need 3000 calories, they will need to eat 3000 calories to maintain their weight. If they need 4000 calories, they need 4000 calories to maintain their weight. In addition, if they eat more than their BMR, they will gain weight, if they eat less, they will lose weight. In theory, you can have 2 totally different people who weight 800 pounds, BUT they each require different amounts of calories to maintain their 800 pounds.
that was irrelevant.. about 5000kcal in about one pound of FAT (not 'body weight')
Yes, if you go over your daily maintenance(the amount of calories your body burns of daily) you will gain weight. If you can keep it at the same level you will maintain weight and if you go under your daily maintenance you will loose weight.
Yes because you gain weight.
When exercising, your body requires more calories than normal. If you burn 600 calories in a cardio session at the gym, your body is missing the 600 calories it is accustomed to taking in. If you are gaining muscle, your body is burning 35-50 calories more per pound of muscle you have gained, and you'll feel hungrier. A great thing to do would be to find a calorie calculator online, input your height, weight, age, and frequency of exercise, and it will tell you your maintenance calories (which are the calories needed to maintain your current physique, obviously). If you are looking to lose weight, eat less than this. If you are looking to gain, eat more.
eating the same amount of calories that you burn in a day will make your weight stay the same, to lose weight burn more calories then you eat and to gain weight eat more calories then you burn
Yes, and no. Younger adults, like those in the 20s to 30s, tend to require some more calories than that. 30s and older, however, begin to requrie less calories. Also, activity level does need to be factored in. Some teens are considerably more active than adults in sports.
Body weight times 10 in calories in order to maintain current weight.
You gain weight when you consume more calories than your body burns. Alcohol has a lot of calories. If you don't increase the amount of exercise you get to balance the increase in calories you will gain weight from drinking.