I have mistakenly deleted my food log on my iphone screen. How can I bring it back?

IF computer = Windows
THEN GOTO
Recycle Bin.

Click the file-icons for what you want back.
Select 'Restore these files'.

BUT.....
As deleted files are secretly marked by Windows as 'write-space available', there is a chance that work done since then has over-written the disk area where files were.

In which case restoring is not possible.

There are possible ways on how to retrieve those deleted Facebook Albums. In times like this, you need a professional program to help you get those important conversations back. The easiest and fastest way to retrieve those deleted Facebook Albums is through third-party software. FoneDog - iOS Data Recovery is the world's leading iOS recovery program that has helped millions of users around the globe. It has the highest retrieval rate in the industry and works with all iOS devices such as iPhone, iPad and iPod Touch. To begin the deleted Facebook Albums recovery, follow the simple steps below:
Option 1.The three-party application for restoring deleted messages
Step1. Run FoneDog - iOS Data Recovery after download and installation

Step2. Click "Recover from iOS Device" from the left-side panel tool options
Step3. Scan and Recover Facebook messages from iPhone Completely
More refer:
How Do You Retrieve Accidentally Deleted Text Messages from iPhone 7 or iCloud Backup
How to Recover Deleted Viber Messages from iPhone 7/ 7 Plus
Hope it can help you sooner

Scroll all the way down, last line = "deleted calls". Tap that and there you are.
Now when you scroll from here, you can then Absolutely and Final delete.

Do you have backups from your lost iPhone 4?
If not, take a look at this guide about recovering iPhone contacts without backup.
How to Recover Deleted Contacts from iPhone without Backup

If you lose the contacts on your iPhone 5s, you can use a data recovery software to help you recover the lost files like contatcs, it is very useful.
And you need to launch the software on computer, then through the USB cable to link the phone with computer.
In the end, you can mark the deleted ones to recover on your iPhone easily.
How to Recover Deleted Contacts from iPhone 8 7 6S 6 5S 5

If you synced your iPhone after you received that call and have not synced it since you deleted the call log then it may be possible to retrieve it by performing a restore on your iPhone and using the iPubsoft iPhone Backup Extractor.
Resource from:

How to Retrieve Deleted Call Log on iPhone 5 4S 4

There are two ways to delete music from your iPod. The first is to delete songs in your iTunes library and have iTunes sync your library to your iPod automatically when you plug your iPod into the computer. The second is to manually delete music by resetting the options to a manual setting and deleting music directly from your iPod without affecting the songs in your iTunes library. Follow these steps to delete music from your iPod. Open up iTunes by double clicking on the "iTunes" icon. Go to "Library" on the far left side of the screen. Click "Music" from this list, which will bring up all your music on the main part of the screen. Choose a song you would like to delete from the list and right click on it. Click "Delete" from the drop-down menu that appears to delete your song. Go to the bottom of the left column on the screen to "Playlists." Click on one of your playlists to bring up the list of songs in the list. From there you can delete a song on the list. Connect your iPod to your computer. The iTunes program will automatically sync your iPod to whatever you have changed in your iTunes library as long as it is set to the default settings. Manually Delete Music Connect your iPod to your computer. Open up iTunes. Choose the third option in the "Options" menu called "Manually manage music" by checking the box next to it. It will ask you if you are sure you want to manually manage music on your iPod. Click "OK." Go to "Devices" on the far left column on your screen. You will see your iPod's name directly underneath that with an arrow pointing to the right. Click on the arrow, which will cause it to rotate until it is pointing downward and a drop-down menu will appear with all your songs listed. Click on a category or playlist, which will bring up all the songs in the list in the main section of the screen. Choose on a song listed that you would like to delete and right click on it, then click "Delete" from the drop-down menu that appears to delete your song.

For us to be able to securely recover deleted call history from iTunes with no data loss, you need to use third-party recovery tools. FoneDog iOS Data Recovery is the popular choice among all iOS users globally because of its user-friendly process and effective methods. It has three recovery methods you can choose from: 'Recover from iOS Device, Recover from iTunes, and Recover from iCloud'. All these three options are very easy to use that this software was tagged as the most customer-centric recovery tool.The lost data can be in any form-contacts, video, voice notes. To learn how to recover deleted call history from iTunes without having to lose your current data, follow these steps:
Step1. Launch FoneDog Toolkit-iOS Data Recovery and Choose 'Recover from iTunes'
Step2. Scan, Preview, and Recover Call History

Retrieve Removed Call Chats from iPhone Without Backup
1. Run FoneDog Toolkit-iOS Data Recovery and Connect iPhone to PC
2. Scan the iPhone Device
3. Preview and Recover Call Chats

Now that you have learned how to recover deleted call history from iTunes, you can now value the importance of having backups especially the iTunes. Yes, backups may seem unnecessary at times but we always remind our users to keep them a habit. You will never know when you need backups unless you are in great trouble. Download the Free Trial version of FoneDog Toolkit -iOS Data Recovery and discover which method works for you!
Completed guide: How can we recover deleted call history from iTunes and iPhone?

connect your iPhone to iTunes and check if you can recover your iPhone..
Otherwise you could contact a premium apple reseller...