Lindsay Lohan shopping at Philips Jewerly store in, Beverly Hills, California - 19.02.09

The actress has been photographed looking slimmer in recent weeks, prompting fears for her health.

Her mother Dina recently urged Lindsay to "eat more McDonalds" and now her estranged dad is weighing in.

Appearing on U.S. breakfast show Good Day Philadelphia on Tuesday (24Feb09), Lohan Sr. said, "Lindsay goes through her fluctations in weight for different roles she's in, and travelling and what she's eating and taking care of herself.

"I'll talk to her about it - I'll see what's going on."

But the 48-year-old admits he has a troubled relationship with his daughter, because of his public disapproval of her romance with DJ Samantha Ronson.

He adds, "(Our relationship) has been a little strained because of her relationship with Samantha, but we do communicate."

Source: WENN