Please choose the correct ending to complete the given sentence: Health: [header] How to lose weight in 3 weeks [title] Skip fad diets. [step] Fad diets may lead to some immediate results, but they're rarely healthy, and the results never last. Fad diets typically mean a gimmick that doesn't include a well-balanced diet.

Ending1: [substeps] Skipping regular fad diets, you could end up eating more carbohydrates than you usually would. This leads to overweight or underweight people losing weight. Ending2: When you skip these diets, these diets seem to serve no real purpose at all, which can lead to weight gain and loss. Fad diets can include : [substeps] Losing weight and sticking to low-carb diets. Ending3: Instead, the weight loss symptoms improve over time. [substeps] Do not skip fad diets if you're pregnant or or breastfeeding. Ending4: You miss out on key nutrients over the course of the diet. Most people immediately put the weight back on after concluding the fad diet as well.

Answer format: ending1/ending2/ending3/ending4