My sims are rapidly gaining weight in one day!

Working on this problem, almost have a breakthrough, back soon with findings, ;) :)

@Feisbukaite Oh, you have skinny sims? I have some of those too, just cover with dress options.like with jackets.
If you put on an outfit and you look too skinny what do you do, change lol. they can wear layers. I have some too skinny kids, they do grow up to be the same. But I do not worry about them.

What people find attractive today(media) is normal to thick. to even thicker. it's fashionable. the problem with our sims being thick is we do not want the thick to go overboard. maybe they can allow us to give sliders in CAS for each sim like they can go from this slim to this thick and no more. let it be up to us.

That's a good solution but not the answer to the op's problem at the moment. that would have to be implemented.

My sims seem to gain weight faster than they should. When I have them exercise, it takes a long time to get that weight off. They do not overeat. Perhaps, the weight gain could be tweaked a bit.

I just remembered, I bought the Fitness pack so they could also do a TV workout. It helps if your sim is too busy to go to the gym or jog, or can't afford to buy equipment for the home. It's easy enough to squeeze in a TV workout because you don't have to spend time traveling to a gym and you don't have to spend additional money or try to find space for exercise equipment.

I normally watch what they eat too. The most recent households were an exception to that. One, with learning all the recipes and going the Grilled Cheese aspiration, and the other being an uglacy save. I wasn't focused on watching what they cooked and how much they ate so they all got pretty big. They did actually own a treadmill but nobody used it. :D

So far, my sims have been lucky or either they have a fast metabolism. LOL They eat a lot and having gained weight. I wish I could do that.

Sims are strange who knows what lurks in the minds of a sim. can they think? Come on guys you don't think the Sims 4 Sims really know what they are eating, lol. omg, that would be absurd. hahaha, you Simmers actually think the sims knows Ice cream and cake from say their shoe? hahaha. If we put their shoe on a plate they would eat it. Come on Simmers. They do not care what they eat. So let's just stop with the talk of giving them diet ice cream, and they will lose weight, that's a joke right.?

My Sims the lover of Ice cream the mother of 2 won't even make ice cream unless I direct it to. and I do mean (it). a pixel lol.
So what if I direct her to eat dinner and she cancels it for another cone full of ice cream.
So I just got her husband to make the diet Ice cream. even while he was making the two quarts I asked for. his wife the ice cream cone lover. Went right to the fridge and got a cone sat down and ate it then she got another. So I, having the superior brain. took the last of it and put it in the garbage. and I place the two quarts of diet Ice cream in the fridge. Well, see my sims are not fat yet. So I just thought why not start early.

So satisfied that I was handling things well. sent the husband to work on the garden/farm. While I was busy with working and evolving. I looked over and saw
That wife of his busy making Ice cream had finished and was eating it from her inventory.
It's no way that pixel could know that was diet ice cream. so I took what she had made and put the ice cream maker into the household inventory.
It took her some time but she broke. Yay. She went and got one. a diet Ice cream cone. Then I knew I had won, :p Now to make that diet cake. ;) . All done diet cake and diet ice cream.

You know how the Sims always go and get the cake or ice cream when they get hungry. ( the ones that are not on the new let's starve thing.)
Well, I saw my sims getting the fruit salad, burgers, even old mac and cheese. anything but that diet cake, and diet ice cream.

So in a day or 2, I went off to find some fat sim to give the diet duel to.
but I got sidetracked. While at a restaurant seeking out fat Sims I spotted The husband of my Ice cream loving sim. seems he has taken a liking to their thick nanny they were flirting and holding hands. :o , and I even heard he now calls his wife skinny chicken legs. I saw her if she turns sideways you see nothing but a line. Opps. hahaha.
That Ice cream diet of @rosemow 's should come with a warning, could have some bad side effects like divorce maybe? or skinny chicken legs lol.. o:)
warning: do not use on none fat sims.

I have my sims go jogging, use a treadmill, exercise equipment, or a punching bag to lose weight. If they are only kids and can't exercise easily, I have them go on a peas, garden salad, and grilled fruit diet.

Omg I love body image issues in the sims. I mean, it’s nice to relate when they blow up after eating the third helping of ice cream or cake. I am like, “I get it bud.”

I just wish I could run a few hours on the treadmill and come out looking sleek and slim!

Remember I was supposed to find out why our Sims are fat?
or Why they get fat to fast, well I did. first, they maxed out the weight sliders.
Our Sims are fat for more than one reason. plus all sizes get thrown in a mixer in CAS. So I think they do add them by percentages, like more of one or another as far as size. but I also feel that they have increased the number of fat sims in CAS greatly. So they also send them down to us as townies in that same number.
Now I get fewer elders because I use to always delete them so the game learned from me that I did not want them and I would check often.
So one thing I think would help is to delete your oversized townies.

Now if we notice a townies job is to basically eat. go to our restaurants and go to the city and eat eat eat and walk to one end to the other. you can see this in San Myshuno more than any other city, they are also there to socialize with us and other townies. and to buy from our shops.

For the first time, I see lots of kid townies eating and eating.
https://i.imgur.com/wLcCaQf.png
This guy job is to eat and eat he do not have on shoes lol but eating.
https://i.imgur.com/7b15qKx.png
the girl with the short red hair can change from a teen to an adult. job is to eat.
a Teen
https://i.imgur.com/EzQBfYw.png
a Teen
https://i.imgur.com/W0DqGjr.png
https://i.imgur.com/Av5qpGZ.png


The following 3 pictures are of one of my Sim family's Below is after they got the diet ice cream, I leave to go play a different sim. I find them being townies out getting ice cream, strange don't you think.
https://i.imgur.com/dbKTsue.png
Father in white and son red, mom is there as well
https://i.imgur.com/oHfKHBm.png
This is my ice cream loving Sim. wearing pink and white, hair in the pony. she is married to the man above with his son dad is wearing white and son has on the red shirt. he looks like a teen and he also has a teen sister.they are out buying ice cream and cupcakes I did not bring them here I am with a different Sim.
https://i.imgur.com/08mqiSb.png

But here is the kicker, Our sims the ones we play, are also townies. It's like their second job that they do not talk about.
So you put them to bed and you log out. but nope they do not stay in bed, they go about the town being townies and eating and eating they go to bakeries, by food for their inventory and eat it. they go to the city and eat from stalls, we see them at restaurants eating, but we are not playing them.
Now not all our sims have eating jobs, some are the workers as well. This may be why some do not gain as much or as fast as the eaters, the game do not care who does what as long as there are sims about town.
Another kicker is that townies can change their identity and change back to themselves when you log in, Reason why they sometimes are not at home. where you left them. or just have been about the town having fun eating and eating making friend and enemies and fighting, flirting and drinking, go to parties whatever. also when they get home we think they are hungry because they are in red, this I think is a return home malfunction. also tired. and can not go to work but should be fully rested and teens as well.
If you stay in San Myshuno long enough you will see them and the workers change shifts and new ones come . also some townies will leave and be refreshed into other townies. I saw a young adult change to a teen, with the same body and big belly.

So they gave us the fitness pack and diet cake, and raise the percentage of extremely overweight sims, thinking we would love to reduce them whereby giving us more to do. We would be so busy trying to keep the extra weight off we would not have time to get bored.
Well if our Sims have eating Jobs as townies that should be empty calories and not count at all to their weight but it does. normally and they get bigger and bigger,
Why did they do this and not remove the calories from our sims total, well maybe it would cost man hours and well they would have to pay programmers. so, maybe its why they gave us the fitness pack, only some do not have that pack or kitchen stuff for the diet ice cream. oh well lol.

(Disclaimer: this is theory only Not proven facts.)

If I play another family for a couple of sim days, all the other families end up with weight extremes happening, they get fat, or they get buff, or they end up so thin they're at risk of disappearing if they turn sideways.

IT's frustrating, and I do not enjoy it. :(

Something has definitely changed since I bought the seasons pack. Prior to seasons my sims were able to maintain their weight with the occasional jog or yoga. As a foodie, I like them to try and learn different cuisines so they get a good variety in their diet, but I do limit their sugar intake. Prior to seasons, I didn't have any issues with their weight at all and they were able to maintain their original bodies from CAS.

Since I bought seasons, my female sim gains weight very easily, and when I have her exercise, within a couple of days she'll get thin and develop big muscles with a six pack, and this is just from yoga. Sigh....... I keep having to take them to CAS as I can't seem to get the right balance in-game. My sim that has maxed fitness, didn't have any issues with weight gain, however he gets very muscular pretty quickly now so he too goes to CAS for tweaking.

I only play with a few sims, it would drive me nuts if I played with several+ households as some players seem to do!