Some things that you say are only true if you're talking about a certain group of people or things. To explain which people or things a statement applies to, use the phrase "true for":
A lot of people have trouble losing weight, but that's never been true for me. If anything, I have to work hard to gain any weight.
Research with students has shown that those who don't eat breakfast can't pay attention as well by 10 or 11 a.m., " says Dr. Kenney. "The same is true for adults. We run out of steam."
In the last example above, you can see the phrase "The same is true for adults." "The same is true for ___" is a common way for "true for ___" to appear.