Thanks! I do get fruits and veggies, but my diet is haphazard at best; whatever I eat is not enough of what I ought to. Some days I eat pretty much as I should, others I forget to put anything down until like 5 'oclock.
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Seriously - why do you "need" to gain weight? I'm 6' and 150 lbs (i.e. noticeably skinny) but reasonably fit and strong and I don't need to gain weight. I'd like to be more muscular for vanity (vanititious, vanitudinous ??) reasons, but dont need to be and certainly can't be arsed to do the vanity thing.
Like Glenn, I'm also curious -- why do you need to gain weight? I can see revamping one's diet to eat more healthily, but some people are just naturally wiry.
I recall that you work in a hospital so I'm going to guess that you don't have a set schedule and therefore might not have a set routine.
If that is so, that might explain why you sometimes forget to eat. People with set routines tend to eat at the same time everyday and I think force of habit helps them do that.
I recently read two books that I highly recommend:
Willpower: Rediscovering the Greatest Human Strength
and
Switch: How to Change Things When Change Is Hard
I don't remember exactly which ideas I got from which book -- but either one or both of them talked about how willpower is an "exhaustible resource" so its good to be able to rely on other methods to avoid exhausting it -- such as
* building habits or a routine
* "pre-loading the decision" that is deciding in advance what you are going to do if and when, if/when certain issues come up. For some reason, its usually easier for most people to follow through on a decision already specifically visualized and pre-made in advance that just basically deciding what to do as one goes along even if you have general guidelines.
* if its a matter of doing something you don't want to do -- don't allow yourself to do anything else at the appointed time. Boredom will help you do the thing that you need to do (eating perhaps) since you aren't allowing yourself to do anything else at the moment. (FWIW, I have found this little mind game surprisingly helpful with my procrastination issues. )
* other tips I don't happen to recall at the moment.
Like you, I'm also trying to eat more healthily (albeit lose weight, not gain it) and I find that deciding in advance what and when I'm going to eat is very helpful. I usually know a day ahead of time what I'm going to eat and when -- if not earlier. (Not as anal as it sounds since I do most of my own grocery shopping and cooking so it does naturally follow that I know what I'm going to eat in the near future.)
So ... using that tactic you could decide when you are going to eat the day before and set an alarm on your watch or cell phone to keep "your appointment."
Check! Yay! I do eat plenty of yogurt. I
ce cream yah, but goes right to gut. Also I have a hard time controlling myself, shouldn't eat the whole half-gallon in one sitting...
Since you have no problem eating ice cream

, I'm going to guess that you are just not a fan of food prep.
Healthy foods that require no or little prep and are easy to pack up and take with you are:
Fruits
Nuts
Seeds
Bread, whole grain (debatable with the primal paleo lifestyle crowd)
Sliced turkey, roast beef
Cheese
I esp recommend nuts, seeds and cheese for when you don't feel like eating but think you have too -- they are very calorie dense and healthy foods (in moderation). Even though I have a weight problem, I rely on them myself for the times when I'm very upset*. When I feel that way I totally lose my appetite for days at a time but I can still eat those things without much trouble.
As Tatyana already mentioned I think, frozen vegetables are very easy to prepare. You can either steam them and have them with lemon juice and/or grated cheese or roast them with olive oil and spices. It does take some cooking time, but you don't have to hoover over the food while its cooking and it just takes seconds of prep work.
If you have a thermos, (and I highly recommend the two cup thermos size) you can take it with you.
Sometimes its just easier to have your food with you and not be concerned about figuring out what, where and when to eat in the middle of your day or evening. Another thing that one or both of the above books recommend is that when you need to make a change -- its easier to do so if you minimize having to make constant decisions.
Also, if you really don't like to cook ... consider hiring a neighbor who does and is willing to prepare what you consider to be healthy foods. Probably would be cheaper than eating take out all the time and you may have a neighbor who would appreciate the cash. It's obviously going to be easier to eat food if you find it really tasty.
Lastly, I'm surprised no one mentioned legumes. Not popular with the paleo crowd but AFAIK most of the health industry still considers them to be nutritious. If you decide to buy the canned ones just rinse off the sodium before using.
* rare luckily, but it happens