False. Could not be more untrue.
Especially if one plans on working out. Try hitting the gym 5 days a week when all you eat is garbage. Bet it won't go well. You will lack energy, and your body will be pissed that it's so weighed down.
Another myth...eating healthy is expensive. The most expensive thing I find is produce. Veggies & Fruits can indeed get pricey, but a 10 pack of chicken breasts at my local super market is about $8. That's multiple meals. A box of brown rice is $1-$2. 2 dozen X-Lrg eggs are $3.49. And a huge thing of oats is like $4. Idk about you man, but I eat a TON of food, raise two kids on my own, and we seem to foot the food bill alright.
If you wanna pack on any sustainable weight that won't burn under some cardio, then read the nutrition stickies, find a solid training routine, eat a ton of food, and lift until you can barely crawl to your car. Does eating heavy and lifting heavy take work? Sure does. But this is a game of hard work and dedication.
I wish this was the case for the UK mate, over here, 3 chicken breasts is 5GBP, or 3 packs for 10GBP , veggies and all are cheapish,Eggs are at the cheapest 1GBP for 10 small eggs, but iv learnt that even shopping in the cheapest markets (aldi, lidls) you are looking to spend a lot of money a month if you want to gain weight well