My sims are fat!

[MischaMusic]

My sims are fat. Like, seriously fat. I don't understand why they are gaining weight. And to make it funnier/sadder - it's only the girls. The boys are just fine. What is up? It is just too easy for these poor ladies to pack on the pounds!!

[Fiddlesticks]

I also have this problem! I was really confused because their parents were skinny and I was never overfeeding them, but a whole generation of kids turned out chubby.

Apparently foods in the Sims 4 have calorie values now. So maybe it's now not to do with not overfeeding but feeding them the right things?

[Playalot]

Try using fish tacos. A forum member found all the calorie counts for all the food types (I can't find the tread to link you, sorry!) and fish tacos had zero calories. I feed my sims that and no weight gain, ever!
Also stopping your sim from eating when there is a tiny bit left on the green bar to fill up works, as does working out every day!
Otherwise it's super fluffy sims all round! 

*edited, found the thread. Reubenhoods post (down the bottom of the page) has a spoiler that shows all the calories... its an awesome bit of info 

http://www.carls-sims-4-guide.com/forum/index.php/topic,22051.0.html

[Stormi71]

My super skinny sim packed on the pounds, slowly at first, but then she got quite big as she was focusing on her career and was also a great cook, so she would be making evil, creamy pasta dishes etc. Her husband was quite buff, but he too was focusing on his career and he just got a pot belly. So once my female sim progressed in her career and has more free time, she's become a fitness freak. She lost all her weight, and I have been having her cook mostly the salads and the fish recipes, and some egg ones. She only makes the more calorie laden recipes once a week now. My teen sons, one is normal size, the other is quite chubby, that's just how they turned out when they aged up, and they pretty much ate the same meals at the same time.
My female sim goes for a jog upon waking up each day, and she occasionally does some boxing or treadmill. But she's at fitness level 10 now and I think it said with high fitness, it was harder to gain weight?

[Dellena]

I've managed to keep my sim family slim this time.  My routine is yogurt (79 calories) all around for breakfast (I have a full household).  By the time everyone is home each day and it gets around to dinner time, everyone is fairly hungry (nearly into the orange).  Then I have mom fix a good meal that they all eat.  So just 2 meals a day.  I would avoid the fattening breakfast foods and just use the quick meal.

[MischaMusic]

This is WAY too much like real life!! 
<Mischa grumbles while leaving the computer to eat her freaking rice cake when all she really wants is a brownie>

[Cheezey]

If you're seeing it in children, I've noticed when I put families into CAS through full edit mode while managing households I'm not controlling, that almost all children, even if both parents are still thin, are born about 2/3 to 3/4 of the way up the weight slider. I suspect the game reads pregnancy as the sim being overweight, and then there is a high chance the offspring will inherit that inflated weight.

In your active household, even eating two meals a day, especially if they are not salad or a yogurt from quick meals, your sim will gain weight over time if he or she doesn't also exercise. I had a lazy sim start off at about 25-30% up the weight slider as YA, and even eating half his meals as salad or yogurt, he was at slightly over mid-range when I later put him into CAS after turning adult. Because lazy sims get a bad moodlet after exercising, I didn't have him do any of it.

Previously, when I played said lazy sim and didn't watch what he ate, he had a steady diet of pancakes, BLTs, eggs and toast, and macaroni and cheese, with the occasional cake or pizza, and he was at about 75-80% on the weight slider around his adult birthday. It's gradual so at first I thought it was just a bit of bulking from tending the couple of garden plants and digging up nearby rocks for collectibles, but when I took a screenshot of the family at the table and I had a side view of him, I noticed he now had quite the gut. That was when I put the family into CAS and saw they had pretty much all gotten to that level. The wife had been pregnant a couple of times and just had a baby so to me it looked like she'd gotten a little bigger, but she was so much smaller than she was pregnant that it took a screen shot comparison to really notice how much weight she'd put on.  I also think that on child sims, a bit overweight isn't quite as obvious.

I've found with a non-lazy sim, one quick meal and one more indulgent meal a day along with a jog or workout most days will keep them about the same.  Sometimes you might have to do a couple days of salad only or longer workouts to even it out if there's a party with a lot of cake or something, but usually that's enough.

[tonycdh]

One day I decided to let my Sims do their thing for a while day without any intervention.  When I came back to them 24 hours later, they were all super fat as well. I don't know what they were eating in that 24 hours, but they sure do like to eat when left to themselves. I used a lean potion to reverse the effect. At least they didn't kill themselves.