Weight Loss & Weight Gain

Fatness often plagues NFL players after they retire -- but former lineman Alan Faneca tells TMZ Sports he's helping his old teammates win the battle against obesity .... just like he did.

Faneca -- who played 13 NFL seasons while weighing 320 lbs -- has dropped all the way to 213 lbs ... and ran a full marathon in UNDER 4 HOURS this past weekend.

"There's no reason to be 320 and be walking around post-football," Faneca says ... noting that he made the decision to shed the weight after considering the long-term health issues that have plagued NFL big men in the past.

And now that he's successfully slimmed down, Alan says he's passing along his weight loss secrets to some of his old friends from the Steelers, Jets and Cardinals.

"I have had some buddies reach out that have had trouble and struggled," Alan said while appearing on the "TMZ Sports" TV show ... explaining, "If you dont make that transtiton kind of quick, all of the sudden that 320 turns into an ugly 350."

Ke$ha's music producer Dr. Luke is in serious danger, according to the LAPD, after some of the singer's fans went nuclear -- blaming Luke for her eating disorder.

LAPD's Threat Management Unit filed legal docs -- obtained by TMZ -- asking for a search warrant to hunt down the identity of people who are threatening Luke's life on Twitter.

The vengeful tweets started after TMZ ran a story that Ke$ha entered rehab for an eating disorder because Luke taunted her about her weight. Ke$ha's friend told us ... Luke told her she "looks like a f**king refrigerator."

In the search warrant docs, cops point out some of the tweets, including:

-- "You need to be worried because IMA slit your throat before January is over."
-- "You ugly fat ass bum bitch. Im gonna carve u like a pumpkin with a long sharp knife."
-- "Im gonna gut you like a fish then skin you and glue ur wrinkly raisin skin to a fridge!"
-- "I'm gonna slit your F**KIN throat open then gouge your eyeballs out."

Maurice Jones Drew is winning the battle of the bulge ... 'cause the Jacksonville Jaguars running back tells TMZ Sports he's dropped 15 POUNDS in the past 2 weeks ... and plans to keep it off.

A slimmer, trimmer MJD was out in NYC last night ... and told us why he deserves to be back in the running for top fantasy football RB next season -- and a lot of it has to do with this physique.

Maurice acknowledged that his 2013 season rubbed a lot of fantasy owners the wrong way ... but says, "It's a brand new off-season. Started working out ... I've lost 15 pounds in the last 2 weeks."

You can already see the difference -- it was just last May that MJD was out partying in Florida while smuggling what appeared to be a spare tire under his tank top.

Take THAT, Jenny Craig!

Bad news for chubby chasers ... fat Jessica Simpson has been replaced ... with a hotter, skinnier version.

The 33-year-old mom strolled though JFK this week like it was 2005 all over again ... sporting a pair of tight leather pants that would even make Nick Lachey's head spin.

Despite her appearance, Jessica recently said she's currently 15 POUNDS HEAVIER than she was back in 2009 ... when she rocked the infamous mom jeans on stage at a concert.

Sure as hell doesn't look like it.

Freedom isn't the only thing Jason Trawick gained after breaking up with Britney Spears -- and he's not tripping one bit ... proudly showing off his new gut during a weekend pizza run in Hollywood.

Oh yeah, he got Popeye's too.

Spears and Trawick -- her former agent -- famously started dating in 2010 and were engaged the following year. Barely a year after that, they were single again.

What a waist.

As for the pizza ... our own Gary says, "All fat guys know ... you never eat the pizza out of the box right outside the store. C'mon man."

4:28 PM PT -- Jason just responded on Twitter with a big belly photo, writing, "Thanks @tmz I needed this. Started my diet/workout program today. C u in a month!"

You're welcome ... but a month's pretty ambitious.

Arnold Schwarzenegger is officially in the penis enhancement business ... at least according to Tom Arnold, who says his junk looks BIGGER now because of all the weight he lost using Schwarzenegger's supplements.

As we reported, Tom says he lost 90 pounds in a matter of months thanks to exercise and diet -- including Schwarzenegger's new line of supps -- but added the biggest benefit was in his pants ... because now his penis looks bigger.

Ke$ha is telling friends her eating disorder was caused by her very own music producer Dr. Luke -- claiming he bashed her weight and even called her a big, fat refrigerator ... TMZ has learned.

Sources directly connected to Ke$ha tell us ... it all started when the singer's "Get Sleazy" tour ended in 2011. She says Luke -- who signed Ke$ha to a deal at age 18 -- started ragging on her over the extra lbs she had gained in her downtime.

Ke$ha says Luke -- a huge producer who has worked with Miley Cyrus and Rihanna -- began calling Ke$ha fat and urged her management team to do something about it.

Our sources say Ke$ha complained ... during a music video shoot in 2012 Luke told her she "looks like a f***ing refrigerator" ... and the singer was profoundly affected by it.

We broke the story ... Ke$ha is now in rehab for an eating disorder.

Ke$ha has gone to rehab for an eating disorder ... TMZ has learned.

Sources connected to the singer tell TMZ ... she's at Timberline Knolls near Chicago, the same place Demi Lovato went for her issues.

We're told the singer -- who's a vegetarian -- was admitted early this morning.

Ke$ha tells TMZ, "I'm a crusader for being yourself and loving yourself, but I've found it hard to practice. I'll be unavailable for the next 30 days, seeking treatment for my eating disorder ... to learn to love myself again, exactly as I am."

In Ke$ha's recent music video with Pitbull -- for the song, "Timber" -- she looks discernibly thinner.

Tom Arnold is half the man he used to be, dropping 90 pounds in 9 months -- but he tells TMZ, it wasn't easy ... he had to cut out sugar and bread from his diet and bust his ass exercising.

54-year-old Tom tells us his son Jax -- who was born in April -- is the inspiration for his weight loss. "My son is already cursed with an old dad, so he doesn't deserve to have a fat dad too."

According to Tom, the diet was a huge part, but he also did tons of circuit training, cardio, and took lots of Arnold Schwarzenegger's Muscle Pharm supplements.

Hasta la vista, belly.

Lisa Lampanelli has pulled a Jonah Hill ... the comedian dropped more than a hundred pounds in the last year and now she's showing off her new bod.

Lisa posted the photo on Instagram today, more than a year after undergoing a sleeve gastrectomy -- a type of gastric bypass surgery. The progress is really impressive, but Lisa has insisted it's not a permanent fix. She still has to alter her eating habits to keep the weight off.

Toronto's crack smokin' Mayor Rob Ford says he doesn't need help with booze and drugs ... Ford instead says he really needs to come to terms with his enormous appetite.

Ford was on the 'Today' show and told Matt Lauer he's not in any kind of treatment program for alcohol or for drugs ... but claims he's training every day to drop some lbs.

Ford -- who just got stripped of most of his mayoral duties -- admitted he smoked crack cocaine ... "probably in one of my drunken stupors" ... after video leaked showing him smoking.

But you gotta hear Ford explain why citizens of Toronto have nothing to fear when he's on a binge ... because GOOD FORTUNE is on his side.

Kim Kardashian is determined to move all of her baby weight back into her ass cheeks ... and by the looks of things, she's doing one helluva job.

KK hit the streets in Paris this week ... en route to a workout session at a local gym.

So, we gotta ask ...

BTW ... Kim's discovered one of the side effects of breast-feeding -- engorged boobs. Check out the video below ...

Kim Kardashian says she hasn't been in hiding since the birth of North West ... it's debatable.

Kim was leaving a Sherman Oaks restaurant when one of the photogs asked her how it feels to be out of hiding. Her response is interesting.

The Hollywood post-baby game is to dump a lot of weight before stepping out in public. It's been 3 months since the kid was born and we've hardly seen Kim. She's definitely trimmed down and is pretty much back to being herself.

No surprise ... she's mum on Lamar.

Christina Aguilera flaunted her hot new bod last night ... but it wasn't her body people are talking about ... it's her face -- because it looks ... well, different.

She didn't explain how she did it last night on "The Tonight Show with Jay Leno."

So we gotta ask...

Chaz Bono is the incredible disappearing man -- 'cause dude has nearly shed a whole Honey Boo Boo worth of lbs since dramatically changing his diet last year.

Chaz was barely recognizable as he was spotted in Los Angeles today ... walking around in shorts and a pretty tight tee.

Earlier this year, Chaz talked about how he dropped nearly 70 pounds -- not through surgery -- but through sticking to calorie-controlled meals ... and doing a ton of martial arts training.

Chaz's original goal was only to lose 50 lbs. -- so he's clearly blown that away.

Jessica and Kim K. ... take notes.