text: can a person lose weight without even trying? if a person does, is it a bad thing? please explain if you were to reduce your calorie intake by 100 calories a day you could lose weight. for example you swap a coke a day with water. there are various reasons why people lose weight. some include sickness, stress, worms even. some explained and others can't be. if you aren't sleeping enough that can also assist with weight loss. so the answer is yes, a person can lose weight without even trying.