Jennifer Lopez's Extreme Weight Loss Scares Family

Jennifer Lopez at the Votolatino Party in Denver, Colorado during the Democratic National Convention.

Gene Young / Splash News

It's no secret Jennifer Lopez is attacking her baby bulge head-on: the superstar is participating in a gruelling triathlon on September 14 to get her body back to pre-baby shape, and the results of her hard work are evident.

But one British tabloid reports that Jennifer's extreme focus on weight loss is concerning her family and friends. A source tells Now magazine, Jennifer gained 75 pounds while pregnant with twins Max and Emme and has lost 50 of them so far—but has hit a wall and can't seem to lose any more weight, no matter how much training she does.

Despite her busy schedule, the source reveals, Jennifer refuses to lessen her demanding exercise regime and rarely eats more than 1,000 calories per day, just half of what's normal for a woman of her size.

Concerned with her extreme dieting, Jennifer's husband Marc Anthony reportedly ordered her to consult with a doctor, who diagnosed her with an underactive thyroid gland, causing her metabolism to slow down.

The pressure to get back into top form has caused tension between Marc and Jennifer, according to the insider. "Let's just say some of their discussions have been pretty explosive," the source reveals.

We know Jennifer is one determined—and stubborn—lady, but we doubt she would be so stupid as to put her health in danger to get back into her pre-baby jeans. Besides, is Marc really one to worry about someone being too skinny?

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'I have hypothyroidism, Hashimoto's to be exact which part of entails an under active thyroid which does make weight loss difficult. I however, took my baby weight off slowly at a rate docs consider safe + I am thinner now than before I ever even met my husband. Your thyroid is nothing to play with, it controls metabolism + the release of "feel good hormones", amongst regulating other bodily functions. It is not something to be toyed with. I hope her doctors read her the riot act........enough is enough! From one Bronx Girl to another............KNOCK IT OFF, YOU CAN PUT YOURSELF IN HARM'S WAY. I KNOW TWO PEOPLE WHO WOUND UP W/THYROID CANCER + IT IS NO JOKE. I have to get biopsied every six months.' bellastrega, September 4, 2008 - 9:01pm

'The pressure's always on for celebrities to look their very best. She just had twins not too long ago and look how good she looks already! The only concern I have is if she eats rarely more than 1000 calories but training for a triathlon, she could pass out. She really needs to take in at least 2000 calories because she'll burn it all off with the swimming, cycling and running that's required. Cuidado Jennifer! We love you and you look terrific, take your time. You want to reach your goal in a healthy way.' Laughing, September 4, 2008 - 5:41pm

'No one is ever at a loss for words she looks great and it's admirable that she is taking care of herself. so many women stop caring about their own needs when they become mothers and then feel trapped, and depressed.if she were still heavy,people would still have opinionated remarks. she's just like any other woman ,getting back to her place of Normalcy,Cut her some slack!You Go Jen!' Bella66, September 4, 2008 - 12:27pm