Well, of course not! Think of eating fat from nuts and avocados. Then think about eating fat from cream and bacon. Big difference, fats can actually be good for you and are an essential part of a healthy diet. The whole idea that all that matters is the rationing of them is so old school, and dates back to when food science first began brainwashing us.
Carbs from white rice and white potatoes vs. brown rice and sweet potatoes.
There's names for the stuff - complex carbohydrates, monounsaturated fats - vs. simple carbohydrates, poly or saturated fats.
The only way that statement is true is in matters of weight loss or gain. Eat 800 calories a day from pure lard and you will lose weight, vs. eating 1,400 calories of bean sprouts and steamed kale (um, not that that's even possible...but you get the idea!)
Mechanically separated meats are a horror, take a look:
http://en.wikipedia.org/wiki/Mechanically_separated_poultry
As I've been saying all along, it really doesn't make sense to use hot dogs as the primary protein when making a homemade food. The whole idea of feeding a homemade diet is to stop feeding your fish crap, even if they love it. With so many cheap sources of quality protein, and with hot dogs being the ultimate "mystery meat" - IMO feeding hot dogs, in any way, shape, or form - just negates the whole "I want control over what I feed my fish" benefit of feeding homemade food. There are so many things in hot dogs that are left out of the ingredient list.
A food called Plecocain is said to cause a "feeding frenzy" ....hmm...could it be the sprayed dried animal blood cells? They sell this in the bait section, if anyone's interested in using it for their homemade food
Feeding fish a quality food is not just about their feeding reaction...plenty of bait food in the fishing department can provide this reaction. It's about feeding them quality food, and even if a formula is 70% fresh veggies and 30% hot dogs, it's still 30% crap, IMO.
Oh, and feeding ducks and pond fish garbage is really a sad, disheartening topic. Don't even get me started on it, but read here if you'd like:
http://www.liveducks.com/bread.html