Is it worth it?
Is being more physically attractive worth being hungry and tired?
To be honest, the more regularly I've exercised and the more I got myself to bed at a decent hour, the less tired I've been. In fact, the more I go the gym, the more energized I find I am!
As for being hungry... I'm never hungry. The point of "dieting" isn't to starve yourself, it's to train your body to want decent, healthy foods. If you do find yourself hungry, fill up on things that are super low/no calorie. Big green salads full of veggies are like a freebie. A couple of tablespoons of light dressing is really low cal, and you can fill yourself right up. Pickles have like.. a whopping 9 calories if you get the right ones, like Dill (ones that aren't sugar-filled). If you binge on an entire jar of pickles, you're eating like.. what, 100 calories tops? You get three times that from a chocolate bar.
I'm obsessed with flavoured rice cakes. White cheddar are amazing, and only 40 calories!

Anyhow, the point is to find low-calorie foods that you love to fill up on when your tummy rumbles. When it does, your body is telling you it needs food, and you shouldn't let it enter starvation mode. Just fill it up with the good stuff.
Worth giving up some of your favorite foods?
I'm with Jilly. You don't have to GIVE UP anything, you just have to suddenly be a lot more concerned about portion control. I ate a Kitkat the other night. I've still lost a pound since then. Now, it may have been a different story if I'd eaten 6 Kitkats... (Which I totally could've done, I love those babies.

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Worth not spending time with your family and friends?
? Is this because you're too busy with gym time? Or because you don't want the temptation you have while out with friends and family...?
I coerced a couple of friends who were looking to change around their lifestyles to join me in my gym excursions. Also, once you've stuck to a diet for a few weeks straight, I've found that my cravings have subsided for the most part. Going out to a friend's birthday, I'm fine just to allow myself diet sodas and a non-fried meal, and a small slice of her birthday cake. If I feel I've binged too much on junk there, I double up my gym efforts the next day, and compensate calorie-wise, filling myself up with lower-calorie foods than I would have normally. (I love Vector cereal, but rice crispies are my low-calorie breakfast.

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Is it worth not spending your time on a more meaningful hobby?
What's more meaningful than adding years to the end of your life? Besides, the more you work out, the more you go to the gym, the more energized you become, the more the more time you feel you can devote to numerous activities!
Worth compromising your entire life?
To be honest... I think my being overweight has moreso been compromising my life. If we mean literally, my LIFE... well, there are so many weight-related illnesses... let's just say I'd like to avoid diabetes and heart-attacks, and as Kery mentioned, the simple tragicness that is being out of breath after climbing ten steps.
If we're talking more figuratively, my social life has been entirely compromised already by my weight. I'm self-conscious when I'm in public, ALL THE TIME. I always feel like people are watching me when I eat and judging me for what I put in my mouth. I sometimes see myself in pictures and cry. There have been nights where I haven't gone out, because I tried on a bunch of outfits and felt disheartened by the muffin-top I had going on above my jeans and the roll visible through what otherwise would've been a gorgeous bar top.
My life is already compromised by my weight. My weightloss.. if anything, is going to help me live life a little.
Worth risking breaking a bone or pulling a muscle (all those physical pain)?
Do your exercises right, and this shouldn't be a problem!
I've had achilles tendonitis before... and that was back in the day when I went to the gym once every three months. ****, I think I'm much more likely to slip on some ice outside and break a bone than I am exercising on the elliptical at the gym. And I think the risks of being overweight are much more severe than the risks of working to get the weight off.
Worth being more selfish?
More selfish in what way?
As a quick addition to my giant rant... I am forming bonds with people. I keep meeting more and more women at the gym, and I've got workout buddies--- girls who live near me who I never really talked to before until we started working out together... the girls who work at the gym are WONDERFUL. Total sweethearts, and we chat every time I go in now!
And while it may not be as significant to some, I'm forming bonds on 3FC. There are people on here who I now talk to everyday. After going to the gym and making an *** of myself in front of this really gorgeous guy, I can't wait to get home to tell everyone on the weekly chat so we can all laugh at myself.
As to your career... I don't know how weight loss is going to hinder advancement in any way.
I've heard of studies where people who looked healthier and thinner and more put-together did better in the workforce irregardless of skills, simply as a result of societal bias. It's unfair, but true.
[Anyhow. Sorry about the rant. LONGEST POST EVER.]