thinness and fitness are two different things. one can be thin and yet fit whereas one can be fat and unhealthy. what is important is that the weight should not be below the normal percentile for your age waist circumference and height. if that is the case the probably you do not eat well. if you eat well you may be having worms in the stool. hence a stool test is a must. if your family in general is thin and skinny there is nothing much you can do about it. even without genetic predominance some people are light weight. the other factors are presence of diseases like diabetes hyperthyroidism tuberculosis poor diet eating disorders malabsorption syndromes and cancers. you can consult your doctor regarding this and eliminate these causes of low weight. if all is fine consult a nutrition expert and build up a good diet program. a physical fitness trainer then can help you gain some muscle mass. however do not go for this unless the medical causes are ruled out because you may need to modify the diet and exercise program according to the problem you have. hope this helps. take care!
age: 20 gender: male height: 5\'6" weight: anorexic build of 55 kg. caloric maintain: 1800 i wish to rebuild up to 60 kg but through a slow process so i can enjoy eating a bit more whilst ensuring health and safety. last year i went through a binge stage of lots of junk eating. on a daily basis i was having chocolate lollies kfc for lunch a large mocha and big cookie and much more fatty (and half disgusting) food. it took four months to put just 6 kg on. well the past two weeks i have been eating more and calories etc but i have happened to place 2 kg on already. i am sure it\'s body weight and not water retention / sodium levels. (lately i have had high sodium consumption though). i would like some advice to a slow gain so i can gain 5 kg by september.