Absolutely bang on.It's what you eat that makes the difference and it's really easy to fall into the trap of using having exercised to scoff a bit of extra food. Exercise and training in the volumes performed by an average busy/working person can't compensate for a crap diet. E.g an 8k row, which is a fairly significant workout, sees off about 500 calories. Treat yourself to a parmo afterwards and you'd need another 4 rowing sessions to just balance it out.
One of the best sayings in fitness/weight loss
"You can't out-train a bad diet"